PRE-BLACK FRIDAY SALE · Up to 30% off, already applied · No code · Shop now → Pre-Black Friday: up to 30% off, no code →
1 7
Ask a K2 Sales Tech

Ask a K2 Sales Tech

Verify parts fit & get product recommendations

Mon–Fri: 9 AM–5 PM EST

support@k2-industries.com Or ask via live chat
VERIFIED REVIEWS

2019-2023 BMW Z4 Rega Style Rear Diffuser - FRP

$33.15 $49.00 Save $15.85
Truck freight
Out of Stock
Duraflex  |  SKU: K2-7600-BMW-114-DFS
USA-based support Secure checkout Return policy

30 Day Warranty Details

Questions on fit or freight? Ask our parts team · Mon–Fri 9–5 ET
Rega Style Rear Diffuser — FRP

Fiberglass-reinforced rear diffuser engineered to add visual depth and aerodynamic character to your Z4's rear end. Requires Surface Prep, ready for your choice of paint or clear coat. One-piece construction keeps installation straightforward and lines clean.

✓FRP Construction ✓Requires Surface Prep ✓Single-Piece Design
Key Features
  • Rega-inspired styling - Aggressive lower-rear proportions that blend factory lines without looking bolted-on
  • Lightweight FRP material - Reduces unsprung mass compared to steel or heavy composite alternatives
  • Raw FRP finish - Sand and prep the surface before applying your chosen paint, ensuring perfect color match with your bumper
Specs
  • Material: Fiberglass-reinforced plastic (FRP)
  • Configuration: Single piece
  • Condition: Brand new
What's Included
  • 1x Rear diffuser assembly
Frequently Asked Questions

Will this diffuser scrape on steep driveways or parking lot inclines?

The Rega diffuser extends modestly from the rear bumper. Before final installation, verify ground clearance at the lowest point by measuring from your tire to the bumper, then add the diffuser's extension. Most Z4 owners find standard approach angles manageable on typical roads, but steep or sloped entries may require a test fit first.

Is this a functional diffuser or purely cosmetic?

This is a styling piece designed to enhance the rear end's visual aggression and proportion. While FRP diffusers can contribute minor aerodynamic benefits at highway speeds, the primary purpose is aesthetic. It does not alter downforce or significantly impact performance.

What prep is required before painting?

Sand the surface to promote adhesion, fill any imperfections if needed, and wipe clean before applying your base coat and clear. Work with your preferred shop or painter to ensure color and gloss match your bumper. The quality of your prep directly affects how seamlessly the diffuser integrates with the rest of the rear end.

What to know before you install
Install recommendation Install Type Body shop
Install time Time Plan for a day
Test-fit first Before Install Test-fit first
Prep and paint Finish Prep + paint
FRP fiberglass Material FRP fiberglass
What to expect
FRP parts ship unpainted: plan on test-fit, prep and paint. Minor gap adjustment may be needed before final installation.
PRE-BLACK FRIDAY SALE
UP TO 30% OFF
Shop parts for your car →
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

30 Day Warranty

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.

How To Get The Best Results

Duraflex is the go-to choice for builders doing a proper custom build using flexible fiberglass engineered to be shaped, fitted, and finished by a body shop. This is how serious aero work gets done.

The build process:

  • Sand and smooth the surface before fitting, which is standard for fiberglass aero
  • Test fit before you paint. Pros always do this, it's part of the process
  • Minor waves, pinholes, or uneven edges are normal and part of what your body shop will address during prep
  • Prime, paint, and finish to your exact spec and color

Best for:

  • Builds already going in for bodywork or paint
  • Projects where you want aggressive styling at a price that leaves budget for quality paint
  • Builders working with shops familiar with fiberglass aero, which is most of them

Got questions before you order? Text a tech who's actually installed this part, even after it arrives.

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.

Customer video review of Shipping Insurance

Product came quick and fit great. I love it.

Paul G. 5/5 Verified

Shipping Insurance

Customer photo review of Shipping Insurance

Roof rails a proper fit for my Ford Transit Connect - SWB. Some concern about the threaded connectors, wondering if rivnuts might offer stronger attachment.

Walt E. 5/5 Verified

Shipping Insurance

Customer video review of Shipping Insurance

GREAT EXPERIENCE SHIPPING WAS QUICK IM ENJOYING THE PRODUCT

Emperor A. 5/5 Verified

Shipping Insurance

Customer photo review of NTXGlow RGB Tail Lights (2015-2023 Ford Mustang)

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

NTXGlow RGB Tail Lights (2015-2023 Ford Mustang)

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 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)

What to expect

Parts ship unpainted and require professional prep, prime, and paint before final installation. Minor adjustments during fitting are normal and expected, this is how custom builds get a factory-quality result.

Caleb D.

Caleb D.

Verified Purchase

verified badge

2006–2011 BMW 3 Series E90

Caleb D.

Verified Purchase

verified badge

2006–2011 BMW 3 Series E90

"Delivery guys were super meticulous and helpful, all around great service throughout the shipping process. Got the bumper put on and painted next day! Overall it looks great."

This Is How Serious Builds Get Done

Duraflex has been the go-to aero choice for serious builders for over 20 years. These parts are flexible fiberglass pieces engineered to be shaped, prepped, and painted to your exact spec. If you're doing a proper build with body shop work planned, this is the right part.

Flexible fiberglass composite
Flexible fiberglass composite
Conforms to your car's exact body lines during fitting.
Ships prep-ready
Ships prep-ready
Arrives ready for your body shop to prime, paint, and finish to your exact spec and color.
The shop standard
The shop standard
The most widely fitted aftermarket aero brand, your body shop has worked with these before.
Build budget that makes sense
Build budget that makes sense
Aggressive styling at a price point that leaves real budget for the quality paint job it deserves.

Why Buy Duraflex From K2 Vs. Anywhere Else

We don’t just sell parts. We actually give a damn.
Fitment guidance before you order
Carrier claims handled for you
Tech support after delivery
Return policy
Expert install guidance
Curated Quality
K2 Industries
Return policy
Other Brands
Check seller terms
K2 Industries
Other Brands
Fitment guidance before you order
Carrier claims handled for you
Tech support after delivery
Return policy
Return policy
Check seller terms
Expert install guidance
Curated Quality

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.

Keep building your BMW Z4 (2019+)

Shop BMW Z4 (2019+) parts
Vehicle build featured by K2 Industries

Frequently Asked Questions

Will this fit my exact year, make, and trim?

Check the listed year, model, trim and body style before ordering. If you are unsure, email support@k2-industries.com with your vehicle details and the product link for help checking compatibility.

Do I need a body shop to install this?

Yes. Duraflex parts are engineered for professional prep, prime, and paint. They're built for builders doing a proper custom finish. Your body shop has almost certainly worked with Duraflex before, it's the most widely used fiberglass aero brand in the aftermarket.

What does the prep and install process look like?

Your shop will sand, test-fit, smooth any minor imperfections, prime, and paint to your exact color spec. Minor waves or uneven edges on raw fiberglass are completely normal and are addressed during prep, this is standard for any custom aero build.

How close will the panel gaps be?

Duraflex parts are designed to fit within acceptable custom aero tolerances. Because they're flexible fiberglass rather than OEM plastic, minor adjustments during fitting are normal and expected. Your body shop will dial in the gaps during the test-fit stage before paint.

What if my part arrives damaged?

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 still get help after the part is installed?

Yes. Email support@k2-industries.com with your order number and installation question so our team can help.

What if it doesn't fit at all?

If there's a genuine fitment issue, not a prep issue, we make it right. Our team will work with you directly to find the correct part or issue a refund.

Can I pay in installments?

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.

How long will it take to receive my order?

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

Do you ship overseas?

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

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

Shop our Garage Sale

View Products >>