MHC+ BMW F80 M3 & F82/F83 M4 GTX Rear Diffuser In Pre Preg Carbon Fibre

Upgrade the rear styling of your BMW with the MHC+ GTX Rear Diffuser for the F80 M3 & F82/F83 M4, a premium carbon fibre aero upgrade engineered to deliver aggressive motorsport-inspired styling with OEM-level fitment and finish. The diffuser integrates seamlessly with the factory rear bumper while adding greater depth, sharper fin detailing and a more technical rear-end appearance.

Manufactured from 100% pre-preg (“dry”) carbon fibre, it combines lightweight construction, exceptional rigidity and a flawless high-gloss finish – and it is the easiest component in the GTX range to fit, going on in around 15 minutes using solely the OEM mounting points.

Key Features

• Designed for the BMW F80 M3 & F82/F83 M4
• Premium GTX rear diffuser design
• Manufactured from 100% pre-preg (“dry”) carbon fibre
• OEM-style 2x2 twill carbon weave
• Deep high-gloss UV-resistant lacquer finish
• Developed using full 3D chassis scanning and CAD engineering
• Fits using solely OEM mounts – no drilling, no adhesive
• Direct replacement for the factory diffuser
• Modular design – undertray add-on can be fitted at any time
• 15-minute fit
• Backed by MHC LDN’s 3-year warranty

GTX Rear Aero Styling

The diffuser forms the main visual centrepiece of the rear, featuring:

• Aggressive fin detailing
• A deeper and more sculpted diffuser profile
• Enhanced rear-end definition
• A clean centre-section design inspired by motorsport aero concepts

Build It Your Way – Modular Add-Ons

This listing is for the GTX rear diffuser itself – a straight swap for the OEM item and a complete product on its own.

For the full GTX rear aero appearance, the MHC+ BMW F80 M3 & F82/F83 M4 GTX Ultra Aggressive Undertray Add On extends the diffuser further beneath the vehicle. You can:

• Buy both together as part of the complete MHC+ GTX Aero Kit
• Or add the MHC+ BMW F80 M3 & F82/F83 M4 GTX Ultra Aggressive Undertray Add On later as a modular upgrade – the two sections bolt together with the supplied M6 hardware, so nothing needs modifying

Fitment & Installation

Fits using: solely the OEM mounting points – the diffuser clips into place and reuses the factory self-tapping screws. No drilling and no adhesive required

Tools required – items marked (supplied) are included in the box:

• PZ2 driver bit (supplied)
• Trim removal tools
• Panel wipe or IPA and lint-free cloths (alcohol wipes supplied)

Time to fit: 15 minutes
Difficulty: Easy – no drilling required

Remove the old diffuser, clip the GTX diffuser into place with a firm push along its full length to engage every clip, then refit the OEM self-tappers on the underside.

All required fixings and consumables are supplied. Best fitted indoors, above 15°C, on a clean, dry car – trial fit before committing any adhesive tape. A full step-by-step GTX fitting guide is available, and professional installation is recommended for the best possible result.

Precision OEM-Level Fitment

MHC+ developed this component using:

• Full 3D scans of the BMW F8X chassis
• Advanced CAD modelling and engineering
• OEM-level panel alignment development

This ensures flush integration with the factory body lines, accurate panel alignment and OEM-style fitment quality. No cutting or compromise required.

Premium Pre-Preg Carbon Fibre Construction

Unlike conventional wet carbon fibre products, MHC+ uses genuine pre-preg (“dry”) carbon fibre, delivering:

• Increased strength and rigidity
• Reduced overall weight
• Superior weave consistency
• Minimal imperfections or air pockets
• Exceptional long-term durability

Each component is cured under controlled heat and pressure to achieve optimal resin saturation, producing a premium carbon fibre part suitable for high-end BMW builds.

Deep High-Gloss Finish

Finished in a premium UV-stable gloss lacquer, every GTX component offers:

• Excellent resistance to fading and yellowing
• A rich OEM-style appearance
• Seamless compatibility with other MHC+ carbon fibre components

Supplied Ready to Install

• PZ2 driver bit
• Alcohol wipes for surface preparation
• Reuses your OEM fixings throughout – keep every one you remove
• MHC LDN fitment guarantee

Compatibility

• BMW F80 M3
• BMW F80 M3 Competition
• BMW F82 M4
• BMW F82 M4 Competition
• BMW F83 M4 Convertible
• BMW F83 M4 Competition

Why Choose MHC+?

MHC+ is recognised globally for producing premium BMW carbon fibre styling upgrades with precise fitment, OEM-inspired design and exceptional manufacturing quality.

Why Buy from R44 Performance?

R44 Performance supplies premium BMW styling and performance upgrades trusted worldwide.

• BMW specialists
• Genuine high-quality carbon fibre products
• Fast UK & international shipping
• Expert technical support

Upgrade your BMW with the MHC+ GTX Rear Diffuser, delivering aggressive GTX styling, premium pre-preg carbon fibre construction and OEM-quality fitment for the F8X M platform.

Unless explicitly stated otherwise, all products sold by R44 Performance Limited are designated RACE ONLY and are solely for competition or off-road use limited to racing formally sanctioned by a recognized racing organization. Any other use, including recreational off-road use, may violate local, state, and Federal laws. R44 Performance Limited does not implicitly or explicitly confirm the legality of using any products it sells on public roads; that is entirely the responsibility of the consumer.

It is the responsibility of the customer to check with all federal, state local and environmental laws before ordering and installing a product. R44 Performance Limited is not responsible for any fees, fines or costs that a customer may incur as a result of failing to check with federal, state, local or environmental laws before ordering and installing a product.

We get a large number of custom orders and requests everyday, so as a result it is not always possible for us to keep every item in stock at all times in our warehouse. If you require the item urgently please contact our sales team here to check the stock before you make your purchase.

We totally understand if you're not certain a part will be compatible with your car, so we highly recommend contacting us here with your query. Our friendly sales team will then be in touch to confirm if this part is the correct part you are looking for.

All in stock products ship the same day if ordered before 2pm GMT

For out of stock items we will contact you with an estimated wait time if not otherwise specified above.

We offer worldwide shipping on all products. If upon receiving your product you wish to return; we offer a 30-day returns policy. For our in-depth returns information please follow the link. "R44 Returns Policy

All of our products come with a standard warranty of 1-3 years. This is dependant on the type of product however. For more details please see our warranty page here.