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VERIFIED REVIEWS

BMW 3/4 Series M3/M4 G80/G82 Titanium Single Midpipe Straight-through Catback 2021+

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$2,699.99 $3,400.00 Save $700.01
  • Fitment verified for YOUR exact year/model/trim
  • Not sure? Email support@k2-industries.com for a real specialist to help you order
  • Got install questions? Text a tech who's actually installed this part before, even after it arrives
In Stock - Usually ships in 3-5 days
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*Disclaimer: Please input the exact details of your car to ensure precise fitment. Note that some of the components only fit certain models and engines.

K2 Industries  |  SKU: K2-061-BMW-125-EXH
100,000+ Happy Customers100,000+ Happy Customers
30-Day Returns30-Day Returns
One Year WarrantyOne Year Warranty
What to know before you install
Bolt-on install Install Type Bolt-on
Install requirement Requirement Basic tools
What to expect
Most intake and exhaust parts are bolt-on, but rusted hardware, tight access, and sensor placement can affect install time.
Not sure what this install needs? Email support@k2-industries.com before ordering.
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Details

Transform Your BMW G80/G82 M3/M4 with Premium Titanium Single Midpipe Straight-through Catback - High-Performance S58 Enhancement (2021+)

Elevate your M performance with our exclusive titanium single midpipe catback exhaust system. Join thousands of discerning G80 M3 and G82 M4 owners who have unleashed their S58 engine's true potential with our precision-engineered straight-through design that delivers both exceptional performance gains and an aggressive motorsport soundtrack.

✓ Titanium Construction ✓ Single 3.5" Midpipe ✓ Straight-through Design ✓ High Performance

Experience the pinnacle of exhaust engineering with our premium titanium catback system, meticulously designed to unlock the S58 twin-turbo inline-6 engine's true character. Featuring a high-flow 3.5-inch single midpipe design and straight-through architecture, this system delivers enhanced performance, significant weight reduction, and the aggressive exhaust note your M car deserves.

Premium Engineering Design
  • Single 3.5" Midpipe Configuration - Optimized flow design maximizes exhaust velocity and reduces restrictions
  • Straight-through Architecture - Unrestricted flow path delivers maximum performance potential and aggressive sound
  • Precision Titanium Construction - Grade 5 titanium ensures superior durability with exceptional weight savings
  • High-Performance Optimization - Engineered specifically for the S58 3.0L twin-turbo platform
Advanced Titanium Technology
  • Grade 5 Titanium Construction - Superior strength-to-weight ratio with excellent corrosion resistance
  • Significant Weight Reduction - Dramatically lighter than factory exhaust for improved performance dynamics
  • Precision TIG Welding - High-strength joints ensure long-lasting durability and professional finish
  • Mandrel-Bent Piping - Smooth internal surfaces maximize flow efficiency and reduce turbulence
Vehicle Fitment
Model Generation Body Code Year Engine
M3 6th Generation G80 2021+ S58 3.0L Twin-Turbo
M3 Competition 6th Generation G80 2021+ S58 3.0L Twin-Turbo
M4 3rd Generation G82 2021+ S58 3.0L Twin-Turbo
M4 Competition 3rd Generation G82 2021+ S58 3.0L Twin-Turbo
Performance Benefits
  • Enhanced Power Output - Reduced back pressure unlocks hidden horsepower and torque from the S58 engine
  • Improved Throttle Response - Free-flowing design delivers sharper acceleration and enhanced engine response
  • Aggressive Sound Enhancement - Straight-through design produces the motorsport exhaust note M cars deserve
  • Weight Optimization - Titanium construction reduces rear-end weight for improved handling dynamics
Technical Specifications
  • Pipe Diameter - 3.5-inch (89mm) single midpipe for optimal flow characteristics
  • Construction Material - Premium Grade 5 titanium with corrosion-resistant properties
  • Design Type - Straight-through configuration for unrestricted exhaust flow
  • Installation Type - Direct bolt-on replacement for factory catback system
Package Contents
  • 1 Complete Titanium Catback Exhaust System
Important Performance Notice
HIGH-PERFORMANCE SYSTEM: This straight-through catback exhaust system is designed for maximum performance and will produce a significantly louder and more aggressive exhaust note compared to factory systems. Professional installation is highly recommended for optimal fit and performance.
Installation Details
  • Installation Type: Direct bolt-on replacement for factory catback system
  • Skill Level: Advanced - professional installation highly recommended
  • Tools Required: Professional exhaust installation equipment and lifting capability
  • Time Required: Approximately 2-4 hours for complete installation
  • Modifications: None required - direct OEM replacement fitment
Sound Characteristics
  • Aggressive Motorsport Tone - Deep, throaty exhaust note that emphasizes the S58's twin-turbo character
  • Enhanced Engine Sound - Straight-through design amplifies the natural engine harmonics
  • Performance-Oriented Volume - Significantly louder than factory for true motorsport experience
  • Crisp Acceleration Notes - Sharp, responsive sound during throttle application
Material Advantages
  • Titanium Durability - Superior corrosion resistance ensures long-lasting performance
  • Heat Resistance - Excellent thermal properties handle extreme exhaust temperatures
  • Lightweight Performance - Dramatically reduces system weight compared to steel alternatives
  • Professional Finish - Natural titanium appearance ages beautifully with use
Expert Support & Warranty
  • Live Expert Assistance - Team of BMW M specialists ready to verify compatibility and provide installation guidance
  • Quality Assurance - Premium titanium construction with rigorous quality control standards
  • Professional Installation Support - Guidance available for optimal installation and performance tuning
  • K2 Industries Quality - Premium manufacturing standards ensuring exceptional performance and durability
Shipping Information
  • Manufacturing + Shipping:  3-5 weeks to manufacture the product. 1-2 weeks for shipping
  • Tracking: Full tracking provided with every order
  • International Shipping: Available worldwide with calculated rates at checkout
  • Secure Packaging: Professional protective packaging ensures safe delivery of titanium components
Our Promise To You

Every titanium catback exhaust upgrade is backed by our commitment to excellence and customer satisfaction. This premium performance system represents the pinnacle of exhaust engineering, delivering the perfect combination of titanium construction, straight-through performance, and aggressive sound enhancement that transforms your G80 M3 or G82 M4 into the ultimate expression of BMW M performance.

Ready to unleash your M car's potential?

  1. Verify your vehicle is a 2021+ BMW G80 M3 or G82 M4 with S58 engine
  2. Consider professional installation for optimal performance and fitment
  3. Prepare for significantly enhanced exhaust volume and aggression
  4. Complete your order for priority processing and premium M transformation

Join the elite community of BMW M enthusiasts who have elevated their G80 M3 and G82 M4 vehicles with premium titanium catback systems. This straight-through design with single 3.5" midpipe delivers the unrestricted performance and aggressive motorsport sound that defines the ultimate BMW M driving experience.

Experience titanium performance excellence - Order now to transform your M car with the premium exhaust system that unlocks the S58 engine's true potential and delivers the sound of pure performance.

Fitment

Our Guarantee

Warranty Assurance:

At K2 Industries, your satisfaction is our priority, and we stand behind the quality of our products. Here's a brief overview of our warranty:

Defect Coverage:
If you find a defect after receiving your order, get in touch with us. We're committed to resolving the issue, whether it involves a replacement, repair, or refund.

Installation Note:
Please inspect your purchase before installation. Unfortunately, damages post-installation are not covered, so ensure everything looks good beforehand.

Claims Made Simple:
Need to make a claim? Reach out to us at support@k2-industries.com. We're here to assist you. Just keep your original packaging and documentation handy.

Your Satisfaction Matters:
Your trust in K2 Industries is appreciated. We're dedicated to ensuring your satisfaction with our quality automotive parts.

Shipping & Returns

Shipping Information:

At K2 Industries, we strive to provide a seamless and efficient shopping experience for automotive enthusiasts like you. Our commitment is to deliver high-quality parts to your doorstep with the utmost care.

Fast and Reliable Shipping:
Many of our products are stocked in our local warehouse, ensuring swift processing and delivery. Orders placed for these items typically ship within 2-5 business days, allowing you to get your parts in no time.

Extended Selection, Global Reach:
To offer you a broader range of automotive parts, some items are sourced from trusted suppliers around the world. While these products might have a slightly longer processing time, we assure you that the wait is worth it for the exceptional quality and value they bring.

Shipping Transparency:
For products shipped internationally, we provide estimated delivery times on the product page. Rest assured, we are continually working to optimize our supply chain and minimize any potential delays.

Combined Shipments:
To streamline your shopping experience, if your order includes items from both our local warehouse and international suppliers, they may be shipped separately. You will receive separate tracking information for each shipment.

Questions or Concerns?
If you have any questions about shipping or would like assistance tracking your order, our dedicated customer support team is here to help. Feel free to reach out to us at support@k2-industries.com.

You can also track your order here

Thank you for choosing K2 Industries for your automotive needs. We appreciate your trust in us.

FAQs

Will this require a tune after installation?

Bolt-ons like exhaust tips, cat-backs, and basic intakes usually don't. Larger mods — turbo upgrades, supercharger kits, headers — typically need an ECU tune to run safely. The spec sheet indicates if tuning is recommended.

Is this part emissions / CARB compliant?

If you're in California or another CARB-regulated state, check the CARB status on this page before ordering. Many performance parts are off-road or competition use only — if so, we say it clearly.

Will installing this void my factory warranty?

Modifications can affect manufacturer warranty on related components only — not your entire warranty. The Magnuson-Moss Warranty Act protects you from blanket warranty voids. If warranty matters to you, talk to your dealer before installing.

Can I install this myself?

Depends on the part. Bolt-ons are DIY-friendly. Turbo upgrades, headers, and supercharger kits need a professional shop. The product description gives a difficulty estimate.

What You Get With Every Order

Products Selected to Meet Quality & Fitment Standards we Stand Behind.
Products Selected to Meet Quality & Fitment Standards we Stand Behind.
Get Help From People Who Actually Understand Builds & Fitment.
Get Help From People Who Actually Understand Builds & Fitment.
Designed to Resist UV Exposure, Wear, and Everyday Use.
Designed to Resist UV Exposure, Wear, and Everyday Use.
Join Thousands of Builders Who Trust K2
Join Thousands of Builders Who Trust K2

Built By Someone Who's Been There

Max, the Owner, started in his garage making E36 M3 tail lights in his own oven.

  • • Started modifying cars before he could legally drive them
  • • Spent years hunting down parts that actually fit and don't suck
  • • Made the same fitment mistakes you're afraid of

You’re not buying from a warehouse. You’re buying from someone who builds cars just like you do.

Founder photo

What Sets K2 Industries Apart?

We don’t just sell parts. We actually give a damn.
Pre-Order Fitment Verification
Damage Replacement
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Curated Quality
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Pre-Order Fitment Verification
Damage Replacement
Real Experts Answer the Phone
Post-Purchase Installation Support
Curated Quality
30-Day Returns
Add to Cart
GuaranteePerfect fit guaranteed

See Why Customers Love K2 Industries

Frequently Asked Questions

Why Buy from K2 Industries

What makes K2 Industries more than just a parts supplier?

We’re a team of USA-based car enthusiasts committed to helping you get your build right the first time. With our deep product knowledge and close relationships with trusted manufacturers, we ensure you receive high-quality parts that perform. We’re here to support you before, during, and after your purchase, providing personalized advice, part compatibility checks, and responsive customer service. When you buy from us, you’re joining a community that cares as much about your car as you do.

How do I know which parts are best for my car and goals?

Answer: Our team can provide personalized mod plans to match your performance and style goals. Whether you’re building for speed, aesthetics, or both, we’ll help you select the right parts for your vision. Contact us to discuss your project!

Do You Have Financing Options?

Answer: Yes, we offer flexible financing options to make it easier for you to upgrade your vehicle without paying the full amount upfront. Choose our financing option at checkout to split your purchase into manageable payments, so you can start your build now and pay over time.

Visit our FULL FAQ Page

https://www.k2-industries.com/a/faq

Shipping

Do you ship overseas?

Yes, we ship all over the world. Shipping costs will apply, and will be added at checkout. We run discounts and promotions all year, so stay tuned for exclusive deals.

How long will it take to receive my order?

It depends on where you are. Orders processed here will take 5-7 business days to arrive. Overseas deliveries can take anywhere from 7-16 days. Delivery details will be provided in your confirmation email.

Other

Any question?

You can contact us through our contact page! We will be happy to assist you.

Customer Reviews

Overall rating: 4.5 / 5 from 901 reviews.

Customer photo review of 2007-2010 BMW 3 Series M2 Look Front Bumper - FRP

Make better effort. M2- Style Bumper The product was terrible. And no it wasn’t cause of the shipment. Every edge wasn’t straight nor correct. Won’t fit either unless you can weld fiber glass. Don’t recommend. Thing is just botched. For 700$ this product is terrible

Connor F. 1/5

2007-2010 BMW 3 Series M2 Look Front Bumper - FRP

Customer photo review of Shipping Insurance

Wing came in perfect condition! No chip paint, no scratches. Amazing service!

Natalie P. 5/5 Verified

Shipping Insurance

Customer photo review of Spec-D Projector Headlights Ford F150 (04-08) Mark LT (06-08) Halo Black / Smoked / Chrome

They look amazing, and after using ChatGPT to help me understand how to install them (because the instructions were not very helpful whatsoever), I’m glad with how they turned out. My problems are that the lights aren’t too bright, the instructions weren’t helpful, and the arrival date was wrong, even if they arrived early.

Caleb B. 4/5 Verified

Spec-D Projector Headlights Ford F150 (04-08) Mark LT (06-08) Halo Black / Smoked / Chrome

Customer photo review of 2015-2021 Subaru WRX NBR Concept Style Trunk - Carbon Fiber

Unfortunately was damaged in transit. I was so excited I discarded the box and stuff without a thought and only took pictures of the damaged parts as I unboxed it. Seller needs pictures of the shipping label and box as well for any claims/partial refunds. The UPS guy that dropped it off didn't require me to sign for it like it said, just left it at my door. FYI for anyone buying something like this take pictures of EVERYTHING. I installed the trunk anyways cause I already had my trunk off. Decent fitment, no issues closing or opening the trunk but the trunk noticeably sits a little higher than the rear fenders.

Joshua H. 3/5 Verified

2015-2021 Subaru WRX NBR Concept Style Trunk - Carbon Fiber

Customer photo review of Front OEM Cover Overlays - *2024+ Tacoma / *2025+ 4Runner

This sticker sucks! Nice looking until you try to install it. Other stickers I have purchased come with a cover OVER the sticker. Peel the sticker and cover off the backing. Position the sticker over the object and press on. Usually includes a tool to make sure the sticker is firmly installed. Peel off the cover and done. No wrinkles. Not so with your product. No cover. No way to remove the backing while installing. A wrinkled mess.

Chris W. 1/5

Front OEM Cover Overlays - *2024+ Tacoma / *2025+ 4Runner

Customer photo review of 1993-1997 Honda Del Sol Redclear Tail Light Lenses

This isn’t on K2, but the lenses came In which I was thrilled about. I’d already removed my OEM lenses from their housings. The passenger side lense fit well and mostly flush. The driver side, however, looks like it was slightly warped and caused poor fitment and what looks like a small dip in the red portion of the lense. I had no choice but to use them, as my OEM lenses were no longer usable. It can be very difficult to get replacement lenses in a timely manner for a Del Sol. I drive my car everyday, so I had to just go with it. Again, not a K2 issue but presumably the manufacturer.

Thom T. 2/5 Verified

1993-1997 Honda Del Sol Redclear Tail Light Lenses

Customer video review of 2003-2008 Nissan 350Z N4 Style Rear Bumper Cover - FRP

This rear bumper fits great the only thing is the trunk button on the bottom is cut a little to wide but that’s an easy fix it looks great and definitely makes the rear look more aggressive. I love it!

Donovan T. 5/5 Verified

2003-2008 Nissan 350Z N4 Style Rear Bumper Cover - FRP

Customer photo review of Upgraded VANOS Oil Supply Line – M52 / M54 Engines (E36, E46, E39, E60, X3, X5, Z3, Z4)

The box was a little crushed, but the line was packed well and it wasn't a problem. The instructions are 3 pages of color pictures and lots of explanations. Very nice. The line itself is a very nice bit of kit with a swivel AN line end that allows a No-tension install. No leaks so far and it looks great. It came with new banjo bolts and copper crush washers. The only criticism I have is that I would have liked this hose coated in black so it disappears like the original, but it does look good, so I don't mind.

Andrew H. 5/5 Verified

Upgraded VANOS Oil Supply Line – M52 / M54 Engines (E36, E46, E39, E60, X3, X5, Z3, Z4)

Customer video review of 2022-2025 Subaru BRZ Toyota GR86 TRD Style Trunk Spoiler

No damages on the product, and better return policy, I tried to get an exchange and they were charging me a %25 restocking fee when my product was damaged and dented, the communication on the matter was taking about 2 weeks as well.

Leslie O. 1/5 Verified

2022-2025 Subaru BRZ Toyota GR86 TRD Style Trunk Spoiler

Customer photo review of Shipping Insurance

make sure the parts dont come in damaged

Landyn R. 1/5 Verified

Shipping Insurance

Customer photo review of Extend Protection Plan

These side window windows deflectors are durable and do their job perfectly

Cody P. 5/5 Verified

Extend Protection Plan

Customer photo review of Open Front Vents for GR Supra (A90/91)

Not a fan of how thick the sides are on these vent pieces. I feel as if they would have been fine if they kept the oem size on the sides and just made them.

Chad G. 4/5 Verified

Open Front Vents for GR Supra (A90/91)

Customer photo review of BMW Roundel Emblem Covers - Full Carbon Fiber

Roundels showed up good quality and fit perfect. Also, anyone with a G22 who cant find anything for the rear, after emailing to ask them I was told they could custom do the 100mm rear roundel with camera hole cut out but just didn't have it listed. Charged me same cost, mailed it out same day. Highly satisfied!

Benjamin G. 5/5 Verified

BMW Roundel Emblem Covers - Full Carbon Fiber

Customer photo review of Shipping Insurance

The installation was easy and came out. Wonderful thank you product was wonderful with no scratches or dents in it.

Paul A. 5/5 Verified

Shipping Insurance

Customer photo review of TESERY 19" /20" Wheel Brake Caliper Cover For Tesla Model Y 2020-2026

It took a month to get my product once I ordered and paid for it, which was not something I anticipated. There were no instructions whatsoever included in the package, which I found frustrating. The product was exactly as advertised, and I am satisfied with what I purchased. I will be more careful from who I purchased with in the future to make sure I’m not waiting for the slow boat from China.

Douglas B. 4/5 Verified

TESERY 19" /20" Wheel Brake Caliper Cover For Tesla Model Y 2020-2026

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