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AutoTecknic Dry Carbon Performante Rear Diffuser - BMW G90/G99 M5

$1,525.50
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Shipping confirmed at checkout.
AutoTecknic USA  |  SKU: ATK-BM-0841
USA-based support Secure checkout Return policy

Questions on fit or freight? Ask our parts team · Mon–Fri 9–5 ET

Attention BMW G90/G99 M5 enthusiasts: experience the superior design and performance of AutoTecknic’s Dry Carbon Fiber Performante Rear Diffuser crafted specifically for your M5. This advanced rear diffuser engineered with our autoclave vacuum-forming technology mounts seamlessly onto the factory location elevating both the aerodynamic efficiency and visual appeal of your M5. Constructed from authentic 3K Twill-Weave (2X2) Pre-Preg Carbon Fiber the diffuser is finished with multiple layers of high-gloss UV-resistant clear coat providing exceptional durability and an unmistakable sleek aesthetic.

Our dry carbon fiber manufacturing process embodies motorsport-grade quality designed for lightweight strength and precise fitment. Through meticulous autoclave vacuum forming each carbon fiber strand is resin-impregnated molded and cured under vacuum resulting in an even lighter and stronger structure than conventional “wet” carbon fiber. This process minimizes imperfections and ensures a flawless finish free of pinholes or air pockets. The AutoTecknic Performante Rear Diffuser includes robust mounting clips for a secure fit and for optimal installation we recommend removing the rear bumper to facilitate clip insertion. Redefine your BMW G90/G99 M5 with the unparalleled style weight savings and performance benefits of this premium diffuser.

What to know before you install
Bolt-on styling install Install Type Bolt-on styling
Install time Install Time About 30–90 min
Test-fit first Before Install Test-fit first
No paint needed Finish Usually no paint
Carbon fiber Material Carbon fiber
What to expect
This is a bolt-on, clip-on, or adhesive styling part. Test-fit before final install, clean the mounting area, and follow the included hardware or tape placement. Paint is not usually needed unless the product is sold unfinished.
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Shipping, returns & warranty

Wrong item or delivery damage? Contact our team for help with your order.

Inspect your part before signing for it and note any damage on the delivery receipt.

Fitment: Vehicle fitment is listed in the title and description. Check the model years, trim and installation notes before ordering.

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.

Read return policy · Contact us

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.

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 lip or diffuser fit my exact vehicle?

It's designed for the fitment listed on this page. If your model has multiple bumper options (M Sport, GT, RS), confirm which one you have before ordering — these are specific to the bumper style.

Does this ship painted or unpainted?

Composite lips usually ship unpainted or in primer. The spec sheet on this page tells you what to expect.

Can I install this myself?

Yes — most lips and diffusers are bolt-on or 3M tape-on, 30-90 minutes with basic tools. Some require drilling, which is permanent, so check the spec sheet for the mounting method before you start.

How does shipping work?

Most lips and splitters ship standard parcel (UPS/FedEx). Larger one-piece splitters may ship freight. Inspect your part before you sign for it and note any damage on the delivery receipt. Then email support@k2-industries.com with photos within 48 hours of delivery. Our team handles it with the carrier and the supplier, so you don't have to.

See Why Customers Love K2 Industries

Customer Reviews

Overall rating: 4.5 / 5 from 991 reviews.

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Took 2 weeks to deliver with standard shipping. But well worth the wait. Install took 25 minutes with minimal tools and the lights look amazing. Fitment is perfect and the quality is excellent. Its kinda pricey but you get what you pay for with ntxglow products. Highly recommend!

Michael O. 5/5

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

Natalie P. 5/5 Verified

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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

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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

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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)

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

What Sets K2 Industries Apart?

We don’t just sell parts. We actually care.
Pre-order fitment help
Carrier claims handled for you
Real Experts Answer the Phone
Post-Purchase Installation Support
Curated Quality
Return policy
K2 Industries
Return policy
Other Brands
Check seller terms
K2 Industries
Other Brands
Pre-order fitment help
Carrier claims handled for you
Real Experts Answer the Phone
Post-Purchase Installation Support
Curated Quality
Return policy
Return policy
Check seller terms
Add to Cart
GuaranteeCheck compatibility before ordering

The K2 Difference

  • • Check the product fitment notes and contact our team if you need help confirming compatibility before ordering.
  • • Real specialists, not chatbots reading scripts. We've built the same cars you're building.
  • • Freight damage, wrong parts, installation question, we handle it so you don't deal with suppliers or shipping companies.

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Frequently Asked Questions

How do I know this will actually fit my car?

Every part listing shows compatible years, models, and trims. But here's the thing—trim packages and factory options can be confusing. If you're not 100% certain, text us at 772-277-2495 with your VIN or photos of your car. We've done this for 30,000+ builds. We've seen every weird trim combo and factory option.

What if the part arrives damaged or is the wrong item?

Inspect your part before you sign for it and note any damage on the delivery receipt. Then email support@k2-industries.com with photos within 48 hours of delivery. Our team handles it with the carrier and the supplier, so you don't have to.

Can I install this myself or do I need a shop?

Depends on the part. Emblems, front lips, some spoilers, bolt-on, DIY-friendly, you can do it in your driveway with basic tools. Full bumpers, hoods, wide-body kits, possible for experienced DIYers but most people take them to a shop for paint and install. Check the product description for installation difficulty. If you're unsure, text us. We'll be honest about whether you can handle it or if you should take it to a pro. We'd rather you know upfront than get frustrated halfway through.

What's your return policy if it doesn't fit or I don't like it?

Return policy

See the return policy for this item’s details. Questions? We’re happy to help before you order.

Read return policy · Contact us

Do you offer financing?

Yes. Affirm and Shop Pay available at checkout for orders over $50. Split payments over 3-12 months depending on order size. No hard credit check to see your options. Most people use this for big-ticket items like body kits, suspension setups, or wheel/tire packages. Rates vary based on credit. You see the monthly payment before you commit. Makes it easier to build now instead of waiting months to save up.

What if I have questions after I receive the part?

Text 772-277-2495. We don't disappear after you buy. Fitment questions, installation issues, "does this bolt go here" questions... we'll walk you through it. We've installed these parts ourselves or helped hundreds of people install them. You're not getting transferred to a call center in the Philippines. You're texting someone who's actually installed your part before. If we can't help remotely, we'll recommend a local shop that knows these parts.

Why should I buy from K2 instead of eBay/Amazon/other sites?

eBay and Amazon sellers don't answer fitment questions. They don't verify your VIN before shipping. They don't handle freight damage claims for you. If something goes wrong, you're filing disputes and waiting weeks. We're builders selling to builders. We're not the cheapest, but you're not gambling $800 on whether a part fits. You're paying for support, verification, and someone who cares if your build goes sideways.

What does your warranty cover?

Warranty details

Questions about warranty coverage? Our team can walk you through it. Contact us

Shipping

Do you ship overseas?

Yes, we ship all over the world. Shipping costs will apply, and will be added at checkout.

How much does shipping cost and when will I see the total?

Depending on where you're located, small parts can ship free. Large parts like bumpers, hoods, and body kits require freight shipping. You'll see the exact cost at checkout before you pay. Freight usually runs $150-$300 depending on size and your location. We know it's expensive. We negotiate the best rates we can. If you're ordering multiple large parts, text us. We can sometimes combine shipping and save you money. We're not hiding fees in the final step. What you see at checkout is what you pay.

How long will it take to receive my order?

It depends on where you are. Delivery details will be provided in your confirmation email.

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

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