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BMW 3 Series G20 304 Stainless Steel Downpipe 2019+
$1,299.99
$1,700.00
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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.
BMW 3 Series G20 304 Stainless Steel Downpipe 2019+ - Yes is backordered and will ship as soon as it is back in stock.
K2 Industries | SKU:
K2-073-BMW-125-EXH
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Transform Your BMW 3 Series G20 with Premium 304 Stainless Steel Downpipe - Ultimate B58 Performance Upgrade (2019+) Elevate your BMW's performance with our exclusive 304 stainless steel downpipe collection. Join thousands of discerning G20 M340i...…
Transform Your BMW 3 Series G20 with Premium 304 Stainless Steel Downpipe - Ultimate B58 Performance Upgrade (2019+)
Elevate your BMW's performance with our exclusive 304 stainless steel downpipe collection. Join thousands of discerning G20 M340i owners who have unleashed their B58 engine's true potential with precision-engineered exhaust upgrades that deliver exceptional power gains, faster turbo response, and an aggressive exhaust note.
✓ 304 Stainless Steel ✓ 25-30HP Gains ✓ Hand-Crafted TIG Welded ✓ Bolt-On Installation
Experience the perfect fusion of performance engineering and premium materials with our meticulously crafted 304 stainless steel downpipe. Featuring hand-crafted TIG welding, smooth radius bends that eliminate turbulence, and precision CNC-machined flanges, this performance upgrade dramatically reduces back pressure while delivering faster turbo spool, significant horsepower gains, and an exhilarating exhaust note that unleashes your B58 engine's full potential.
Performance Benefits
- Significant Power Gains - 25-30HP increase with proper ECU tuning unlocks B58 potential
- Faster Turbo Spool - Reduced back pressure allows turbo to reach boost pressure more quickly
- Enhanced Throttle Response - Improved exhaust flow delivers instant acceleration and improved drivability
- Aggressive Exhaust Note - Deep, sporty soundtrack transforms your driving experience
Premium Construction
- 304-Grade Stainless Steel - Superior corrosion resistance and exceptional durability for lasting performance
- Hand-Crafted TIG Welding - Meticulous precision welding with back purging ensures leak-free operation
- 4.5" Primary Diameter - Large-volume piping maximizes flow and minimizes back pressure
- Smooth Radius Bends - Engineered bends decrease turbulence and optimize exhaust gas velocity
Vehicle Fitment
| Model | Generation | Engine | Year | Drive Configuration |
|---|---|---|---|---|
| 340i / 340i xDrive | F30 / F31 | B58 3.0L Turbo | 2016-2018 | RWD / AWD |
| M340i / M340i xDrive | G20 / G21 | B58 3.0L Turbo | 2019+ | RWD / AWD |
Engineering Excellence
- Precision CNC Flanges - Machined stainless steel flanges ensure perfect sealing and fitment
- OEM Mount Locations - Utilizes factory mounting points for hassle-free bolt-on installation
- Universal Compatibility - Fits both RHD and LHD models with no modifications required
- Catback Compatible - Works seamlessly with stock exhaust and all aftermarket catback systems
Technical Specifications
- Material Grade - Premium 304 stainless steel construction throughout
- Primary Diameter - 4.5" for maximum flow and performance
- Flange Material - CNC-machined 304-grade stainless steel
- Welding Method - Professional TIG welding with back purging
- Wall Thickness - 1.5mm for optimal durability and weight
- Configuration - High-flow catless design for maximum performance
Package Contents
- 1 Premium 304 Stainless Steel Downpipe Assembly
Important Installation Notice
TUNING REQUIRED: This high-flow catless downpipe will trigger a check engine light. ECU tuning is highly recommended to maximize power gains and eliminate error codes. Professional installation is strongly recommended for optimal results.
Installation Details
- Installation Type: Bolt-on replacement for factory downpipe
- Skill Level: Advanced - professional installation strongly recommended
- Tools Required: Lift/jack stands, socket set, torque wrench
- Time Required: Approximately 2-4 hours for complete installation
- ECU Tuning: Required to eliminate check engine light and maximize gains
Performance Optimization
- Maximum Flow Design - Removes restrictive factory catalytic converter for unrestricted exhaust flow
- Reduced Back Pressure - Significantly lower exhaust restriction improves turbo efficiency
- Quick Spool Characteristics - Enhanced turbo response delivers immediate power delivery
- Tuning Synergy - Works harmoniously with Stage 1, 2, or 3 ECU tunes for maximum output
Durability & Quality
- Corrosion Resistance - 304 stainless steel withstands extreme heat and environmental conditions
- Professional Grade - Hand-crafted construction ensures leak-free operation and longevity
- Heat Management - Premium stainless steel dissipates heat effectively for component protection
- Track Proven - Tested under extreme conditions for reliability and performance
Expert Support & Warranty
- Live Expert Assistance - Team of BMW performance specialists ready to provide technical guidance
- Fitment Guarantee - Precision-engineered for perfect OEM fitment on all compatible models
- Quality Assurance - Rigorous quality control ensures every downpipe meets exacting standards
- Professional Installation Support - Comprehensive guidance for optimal installation and tuning
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 exhaust components
Our Promise To You
Every 304 stainless steel downpipe upgrade is backed by our commitment to excellence and customer satisfaction. Experience the perfect fusion of premium materials, precision engineering, and dramatic performance gains that transform your BMW G20 M340i into a true powerhouse. Unleash the full potential of your B58 engine with hand-crafted quality that delivers track-proven reliability and exhilarating performance.
Ready to unleash your B58's potential?
- Verify your vehicle compatibility (G20 M340i, F30 340i with B58 engine)
- Consider professional installation for optimal fitment and performance
- Plan for ECU tuning to maximize power gains and eliminate error codes
- Complete your order for priority processing and performance transformation
What to know before you install
Install Type
Bolt-on
Requirement
Basic tools
Material
Stainless steel
What to expect
Most intake and exhaust parts are bolt-on, but rusted hardware, tight access, and sensor placement can affect install time.
Material note
Stainless steel helps resist corrosion and is used where strength and durability matter.
Not sure what this install needs?
Email
support@k2-industries.com
before ordering.
Fitment: Vehicle fitment is listed in the title and description. Not sure it fits yours? Email us and we’ll confirm it for you.
Shipping, returns & warranty
Check vehicle compatibility
Check the product fitment notes for your year, model and trim
Need help choosing?
Not sure? Email support@k2-industries.com for a real specialist to help you order
Installation questions?
Installation questions? Email our team before or after your purchase
Warranty details
Questions about warranty coverage? Our team can walk you through it. Contact us
Return policy
See the return policy for this item’s details. Questions? We’re happy to help before you order.
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.
BMW 3 Series G20 304 Stainless Steel Downpipe 2019+
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$699.99
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Unit price
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What You Get With Every Order
Products Selected to Meet Quality & Fitment Standards we Stand Behind.
Get Help From People Who Actually Understand Builds & Fitment.
Designed to Resist UV Exposure, Wear, and Everyday Use.
Join Thousands of Builders Who
Trust K2
What Sets K2 Industries Apart?
We don’t just sell parts. We actually give a damn.
Pre-order fitment help
Delivery issue support
Real Experts Answer the Phone
Post-Purchase Installation Support
Curated Quality
Return policy
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Pre-order fitment help
Delivery issue support
Real Experts Answer the Phone
Post-Purchase Installation Support
Curated Quality
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Check compatibility before ordering
Check compatibility before orderingFrequently Asked Questions
Why Buy from K2 Industries
What makes K2 Industries more than just a parts supplier?
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?
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?
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
Visit our FULL FAQ Page
Shipping
Do you ship overseas?
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?
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?
Any question?
You can contact us through our contact page! We will be happy to assist you.
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
