Performance V2 Carbon Fiber Rear Diffuser Extensions - G80 M3 | G82 / G83 M4

Performance V1 Dry Carbon Fiber Rear Diffuser Extensions - G80 M3

Performance V2 Carbon Fiber Rear Diffuser Extensions - G80 M3 | G82 / G83 M4 - Image 5

Performance V2 Carbon Fiber Rear Diffuser Extensions - G80 M3 | G82 / G83 M4 - Image 6

Performance V2 Carbon Fiber Rear Diffuser Extensions - G80 M3 | G82 / G83 M4 - Image 7

Performance V2 Carbon Fiber Rear Diffuser Extensions - G80 M3 | G82 / G83 M4 - Image 8

Performance V2 Carbon Fiber Rear Diffuser Extensions - G80 M3 | G82 / G83 M4 - Image 9

/ PRODUCT ·DIFFUSER

Performance V2 Carbon Fiber Rear Diffuser Extensions

Name: Performance V2 Carbon Fiber Rear Diffuser Extensions - G80 M3 | G82 / G83 M4
Brand: Horizon Motorsport
SKU: HM-G8X-DF-012
Price: 580.0 USD
Availability: InStock

[ VERIFIED FITMENT ]

G80 M3G82 / G83 M4

Chassis

G80 M3

G82 / G83 M4

$580.00

Shipping calculated at checkout.

Shipped from USA

Additions

Performance V2 Carbon Fiber Rear Diffuser Extensions

G80 M3G82 / G83 M4

$580.00

/ 01 · OVERVIEW

Sharpen the rear profile of your G8X M3 or M4 with Performance V1 prepreg carbon fiber rear diffuser extensions. Designed for sedan, coupe, and convertible models, these extensions enhance the factory diffuser with a longer, more aggressive profile while maintaining a clean OEM plus appearance.

Constructed from 100 percent genuine prepreg carbon fiber and cured in an autoclave, these extensions offer a lightweight yet rigid structure with consistent weave quality and a refined matte finish. Compared to traditional wet carbon, prepreg construction provides improved strength, reduced weight, and a more uniform surface with minimal resin variation.

Installation is straightforward and does not require cutting, drilling, or adhesive. The factory diffuser extensions are removed and replaced directly with the prepreg carbon pieces, reusing all OEM mounting points and hardware for proper fitment. Each set includes both driver and passenger side extensions designed to follow the factory bumper contours closely.

Professional installation is recommended to ensure optimal alignment and long term durability.

FITMENT (Please be sure to select your model below!)

- G80 M3

- G82 / G83 M4

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Ships in 1-3 Days

Flat Rate Shipping

Fully Insured

Processing: In-stock items typically ship within 1–3 business days. We do our best to get every order out as quickly as possible. All orders are quality-checked and ship with full insurance coverage. If an item is out of stock, we'll reach out ASAP with an ETA.

Carriers: Carbon fiber and performance parts ship via UPS. Smaller items ship via USPS.

Tracking: You'll receive a confirmation email when your order ships with a tracking link — you can also track it anytime from the order page linked in that email. Allow 1–3 business days for tracking to update.

International: We ship worldwide. Contact us at sales@horizonmotorsport.com for international shipping quotes.

Signature: We may require a signature for high-value orders. Please be available during your estimated delivery window.

FEATURED BUILD

G80 M3 Competition

OWNER

AP2 Performance

Orange County, CA

SPEC SHEET

VR1 FRONT GRILLSP2 FRONT LIPPERFORMANCE V1 SIDE SKIRTSPERFORMANCE V1 DIFFUSERPERFORMANCE V1 INLETS

F80 M3

OWNER

Brian

Los Angeles, CA

SPEC SHEET

CS V2 FRONT LIPPERFORMANCE V1 SIDE SKIRTSV STYLE DIFFUSERPERFORMANCE V2 MIRROR CAPSGTS STYLE HOOD

@bbriaann_

A90 Supra

OWNER

Danny

Orange County, CA

SPEC SHEET

AG1 FRONT LIPAG1 SIDE SKIRTSAG1 REAR SPATS

OWNER

Brandon

Irvine, CA

SPEC SHEET

VR1 FRONT LIPCSL V1 FRONT GRILLPERFORMANCE V1 INLETSPERFORMANCE V1 MIRROR CAPSHM S58 CATBACK EXHAUST

Horizon Motorsport - Est. 2019

Built for BMW Enthusiasts

We specialize in quality aftermarket parts for BMW M-cars. Every part we carry is selected, inspected, and shipped with the same care you'd give your own build. Our goal: help you get your car looking and performing exactly how you envisioned it.

Learn More

/ ? · ASK A QUESTION

Have a question about this part?

Fitment uncertainty, install details, compatibility with other mods — whatever it is, our team replies personally, usually within 24 hours.

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Performance V2 Carbon Fiber Rear Diffuser Extensions

Additions

Built by Our Customers

AP2 Performance

Brian

Danny

Brandon

Built for BMW Enthusiasts

Have a question about this part?

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