TRE Dry Carbon Rear Diffuser (2x2 Twill Pre-Preg) for BMW M3/M4 G80 G81 G82 G83 2020+ (G8X) - OEM Style Rear Valance / Bumper Diffuser - Autoclave Carbon Fibre (Fiber) - Direct Bolt-On Exact Fit Replacement

TRE Dry Carbon Rear Diffuser Upgrade for BMW G8X M3 and M4

Transform the back end of your G8X with TRE’s autoclave-cured dry carbon rear diffuser. This original-style carbon upgrade delivers a clean factory look with extra presence, sharper lines and a more purposeful stance. Built from lightweight pre-preg carbon fibre in a 2x2 twill weave, it offers a premium finish and an exact-fit replacement that integrates seamlessly with the standard bumper.

Key reasons to choose this TRE carbon upgrade

• Autoclave-cured pre-preg carbon fibre for strength, rigidity and reduced weight
• 2x2 twill weave that aligns with factory carbon trim for a cohesive OEM plus appearance
• Direct swap using stock fixing points for a hassle-free, exact-fit install
• Dry carbon construction for a high-end motorsport look and feel
• Precision moulded and CNC-trimmed edges for consistent panel gaps and alignment
• Enhances the rear profile with bolder fins and a wider, more aggressive aesthetic

We have fitted this TRE diffuser to multiple customer G8X builds and the feedback has been outstanding. Fitment is tight, the weave consistency is excellent and the end result looks like it belongs on the car from factory. If you are after a subtle yet impactful rear-end upgrade that elevates your BMW without going over the top, this is the one to choose.

Compatibility

• BMW M3 Saloon G80 2020+
• BMW M3 Touring G81 2022+
• BMW M4 Coupe G82 2020+
• BMW M4 Convertible G83 2020+

What you receive

• 1 x TRE dry carbon 2x2 twill rear diffuser replacement

Installation

Designed as a direct replacement that utilises the original fastener locations. For best results and perfect alignment, we recommend professional fitting. MJ Modifications offers in-house installation at our Warwickshire workshop. To request a fitting quote, email info@mjmodifications.co.uk.

Pair with matching carbon

Complete the OEM plus look by adding a complementary carbon boot spoiler, front splitter and side skirt extensions in the same 2x2 weave for a consistent, premium finish around the whole car.

Search-friendly terms

BMW G8X rear diffuser upgrade, G80 M3 rear valance, G81 Touring carbon diffuser, G82 M4 rear bumper insert, G83 M4 Convertible rear splitter, carbon fibre rear valance, carbon fiber 2x2 twill, autoclave dry carbon diffuser, plug and play diffuser, exact fit replacement, performance aero rear, BMW M3 carbon rear, BMW M4 carbon rear, G8X body kit rear, carbon rear fins, OEM plus carbon styling, direct bolt-on diffuser, BMW rear lower diffuser, track-inspired rear diffuser, high quality carbon fibre, premium carbon aero for BMW.