Signature Composites
G8X M3/M4 OEM-Style Carbon Diffuser
Installation included at our Dallas–Fort Worth shop — you pay for the part, not the labor.
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G8X M3/M4 Signature Carbon Kit Builder
Build it your way — choose the carbon parts that complete your G8X
$3,208.43 $3,564.93 10% OFF · Save $356.50
Give the rear of your G8X M3/M4 a clean, factory-inspired upgrade with an OEM-style carbon fiber diffuser. Designed to replace the lower rear diffuser section, it adds genuine carbon fiber without changing the vehicle’s original lines or proportions.
- Genuine carbon fiber construction
- OEM-style design and fitment
- UV-protective clear coat
- Lightweight and durable finish
- Maintains the factory rear body lines
A refined carbon fiber upgrade that delivers a premium OEM appearance with added performance character.
SKU SC.G8X.CF.DFR.OEM
Will this fit my car?
Check the fitment information below for supported years and models. Not sure? Contact us with your exact year, make, and model and we'll confirm fitment before you order.
Do you offer installation?
Yes — we're a full-service shop in the Dallas, TX area. Reach out after ordering and we'll get your install scheduled.
What if I need to return or exchange a part?
See our Returns & Exchanges page for full details, or contact us and we'll make it right.
- BMW G80 M3 2021–2027
- BMW G82/83 M4 2021–2027
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