G8X M3 | M4 PSM Dry Carbon Diffuser
Couldn't load pickup availability
Pickup available at LAB X Premium
Usually ready in 24 hoursPairs well with
⚠️ PREORDER NOTICE
This item is currently available for preorder.
Production is underway and inventory is expected to arrive in early February.
All preorder units will ship immediately upon arrival, in the order they are received.
G8X M3 | M4 7-Piece PSM Style Dry Carbon Rear Diffuser
Pre-Preg Dry Carbon Fiber | OEM+ Motorsport Design
🏁 ENGINEERED FOR PERFORMANCE. BUILT FOR PRECISION.
Transform the rear profile of your BMW G8X M3 or M4 with the LAB 7-Piece PSM Style Dry Carbon Rear Diffuser— a bold, motorsport-inspired upgrade designed to deliver aggressive aesthetics while maintaining OEM-level fitment and refinement.
This multi-piece diffuser design adds depth, dimension, and visual width to the rear of the car, creating a far more dynamic look than single-piece alternatives. Every component is engineered to integrate seamlessly with factory bumper lines for a clean, high-end finish that looks factory-plus, not aftermarket.
WHY PRE-PREG DRY CARBON FIBER MATTERS
OEM-Matched 2x2 Weave & Deep Gloss Finish
Designed to perfectly complement factory BMW carbon fiber components.
Lightweight & Exceptionally Strong
Up to 60% lighter than fiberglass or wet carbon while maintaining superior rigidity.
Autoclave-Cured Construction
Precision resin control eliminates excess weight and delivers a flawless surface finish.
UV-Resistant High-Gloss Clear Coat
Prevents fading, yellowing, and sun damage over time.
OEM-GRADE FITMENT — NO COMPROMISES
Each diffuser section is CNC-trimmed, test-fitted, and quality-checked to ensure precise alignment with factory mounting points. Unlike wet-carbon diffusers that often warp or sit unevenly, LAB dry carbon components install flush, secure, and rattle-free.
Install with confidence knowing your diffuser will not gap, vibrate, or loosen under spirited or high-speed driving.
PSM-STYLE 7-PIECE DESIGN
The PSM-inspired layout delivers an aggressive yet refined rear aesthetic, with sculpted fins and layered sections that enhance airflow while giving your G8X a wider, lower, and more purposeful stance.
This design is ideal for owners who want a more complex, premium diffuser look that stands out from common single-piece designs seen on most builds.
KEY FEATURES
✅ 100% Pre-Preg Dry Carbon Fiber Construction
✅ 7-Piece PSM-Style Rear Diffuser Design
✅ OEM-Matched 2x2 Weave Pattern
✅ UV-Resistant High-Gloss Clear Coat
✅ Lightweight, Rigid & Track-Ready
✅ Precision OEM-Grade Fitment
VEHICLE APPLICATION
✔ BMW G80 M3 Sedan (2021+)
✔ BMW G82 / G83 M4 Coupe & Convertible (2021+)
WHY CHOOSE LEGENDARY AUTO BUILDERS
At Legendary Auto Builders, every carbon fiber component is enthusiast-designed, test-fitted, and quality-verifiedbefore shipping. When you order from LAB, you’re investing in true dry carbon craftsmanship, trusted fitment, and a brand built by enthusiasts for enthusiasts.
Legends aren’t born — they’re built. 🏁
G8X M3 | M4 PSM Dry Carbon Diffuser
We’ve got you.
Whether it’s fitment questions, order updates, or install guidance, our team’s here to make sure you get the right parts, the first time. Fast replies, real support, no runaround.
-
Shipping Information
We ship fast and nationwide. Most in-stock items leave our SoCal warehouse within 1–3 business days. You'll get tracking as soon as it’s on the way. Need it quicker? Expedited options are available at checkout.
-
Customer Support
Questions about your order? Our support team is here to help every step of the way. Reach us by email or DM.
Fast responses, real solutions, no bots.
-
Contact Us
Whether it’s about your order, install guidance, or wholesale inquiries, don’t hesitate to reach out.
📞 Phone: +1 (949) 371-5212
📧 Email: orders@legendaryautobuilders.com
📍 Visit Us: 21087 Commerce Pointe Drive, Walnut, CA 91789We’ll always do our best to get back to you quickly and take care of you the right way.
FreshhKiicks Install
When it comes to proper builds, FreshhKiicks knows what is takes to stand out. That's why he chose to go with LAB parts for his LCI X3M.
Your Favorite Builds,
Our Parts
BUY NOW & PAY LATER
Split your purchase into easy payments at checkout. No hidden fees.
FAQs
Do you offer financing or payment plans?
Yes. At checkout, you can use Shop Pay Installments or Affirm to split your purchase into easy monthly payments. Financing options, including potential 0% interest plans, are shown during checkout and are subject to approval.
Will this part fit my BMW?
Yes. Every product we sell is verified for specific BMW models and chassis. If you want extra peace of mind, you can send us your model, year, or VIN and our team will personally confirm fitment before you order. BMW fitment accuracy is a priority at Legendary Auto Builders.
Are your parts OEM-quality or aftermarket replicas?
We only carry high-quality aftermarket parts that meet or exceed OEM standards. Each product page clearly outlines materials, construction, and finish so you know exactly what you’re getting. We do not sell low-grade replicas or poorly made components.
Where do you ship from and how long does shipping take?
Most in-stock orders ship from our California warehouse within 1–2 business days. Standard U.S. delivery typically takes 3–7 business days depending on location. Made-to-order or specialty items may require additional production time, which is always noted on the product page.
Can I install this myself, or do I need a professional?
Many of our products are designed for direct bolt-on installation and can be installed at home with basic tools. For more complex parts—such as aero components or performance upgrades—we recommend professional installation for best results. If you have questions about install difficulty, just reach out.
What happens if the part doesn’t fit my vehicle?
If there’s a fitment issue due to an error on our end, we’ll make it right. Our team will help resolve the issue quickly, whether that means an exchange or another solution. Fitment accuracy matters to us, and we stand behind the products we sell.
Are your products tested for quality and durability?
Yes. All products go through quality checks and are sourced from trusted manufacturers. We work closely with suppliers and installers to ensure every part meets our performance and durability standards before it ever reaches your car.
Do your products come with a warranty?
Most items include a warranty covering manufacturing defects. Warranty length and coverage details vary by product and are listed on the product page. If you ever have a concern, our support team is here to help.