Description
I understand that this item ships from MHC in the U.K., and as the recipient of the order, I am responsible for paying any and all customs fees that are imposed by my country's customs agency for the import.
Complete the aggressive GTX rear aero setup on your BMW F87 M2 or M2 Competition with the MHC+ GTX Ultra Aggressive Undertray Add-On, the lower section of the two-piece GTX rear diffuser system.
Manufactured from 100% pre-preg ("dry") carbon fibre, the undertray and corner sections extend the GTX rear diffuser further underneath the vehicle, creating a substantially deeper and more track-inspired rear profile. This lower aero extension complements the GTX front aero and provides a more cohesive, purposeful appearance across the vehicle.
The MHC+ GTX Ultra Aggressive Undertray Add-On is designed as a modular upgrade, allowing you to add it to an existing GTX Rear Diffuser at a later stage. The undertray attaches to the diffuser using six supplied M6 bolts, while a further four M6 fasteners secure the corner sections. No modification to the existing GTX Rear Diffuser is required.
The system uses OEM mounting points, pre-applied automotive-grade adhesive tape, and supplied stainless steel self-tapping screws for installation. MHC+ developed the component using full 3D chassis scanning, advanced CAD modelling, and OEM-level panel alignment development to achieve precise integration with the factory body lines.
MHC+ backs the product with a fitment guarantee and 3-year warranty, providing additional confidence in its quality, craftsmanship, durability, and fitment.
Important Product Note
This product is an add-on component only and is not a complete rear diffuser.
The MHC+ BMW F87 M2 & M2 Competition GTX Rear Diffuser is required and sold separately.
The Undertray Add-On can also be purchased as part of the complete MHC+ GTX Aero Kit.
Key Features
- Lower undertray and corner add-on for the MHC+ GTX Rear Diffuser
- Designed for BMW F87 M2 and M2 Competition
- Requires the MHC+ GTX Rear Diffuser
- 100% pre-preg ("dry") carbon fibre construction
- OEM-style 2x2 twill carbon fibre weave
- Deep high-gloss UV-resistant lacquer finish
- Ultra-aggressive undertray design
- Extended lower rear aero profile
- Developed using full 3D chassis scanning and CAD engineering
- Designed to use OEM mounting points
- Pre-applied automotive-grade adhesive tape
- Supplied stainless steel self-tapping screws
- Supplied M6 nuts and bolts
- Approximately 30-minute installation time
- MHC+ fitment guarantee
- 3-year warranty
The Full GTX Rear Aero Appearance
When fitted beneath the GTX Rear Diffuser, the undertray and corner sections create a more substantial and purposeful rear profile.
The additional lower section provides:
- A more aggressive and track-inspired rear appearance
- Enhanced visual depth underneath the vehicle
- A more substantial lower rear profile
- Improved visual balance with the GTX Front Splitter
- A complete GTX rear aero appearance
Add It Now or Add It Later
The MHC+ GTX system is modular by design. The Ultra Aggressive Undertray Add-On can be installed at the same time as the GTX Rear Diffuser or added later without modifying the original diffuser.
The undertray attaches to the diffuser using six supplied M6 bolts, while a further four fasteners secure the corner sections. This allows you to run the GTX Rear Diffuser on its own and add the undertray whenever you are ready.
Precision OEM-Level Fitment
MHC+ developed this component using advanced design and engineering processes, including:
- Full 3D scans of the BMW F87 chassis
- Advanced CAD modelling and engineering
- OEM-level panel alignment development
This development process is designed to provide flush integration with the factory body lines, accurate panel alignment, and OEM-style fitment quality without unnecessary cutting or compromise.
Premium Pre-Preg Carbon Fibre Construction
MHC+ uses genuine pre-preg ("dry") carbon fibre rather than conventional wet carbon fibre construction. This provides several advantages, including:
- Increased strength and rigidity
- Reduced overall weight
- Superior carbon fibre weave consistency
- Minimal imperfections and 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 component suitable for high-end BMW builds.
Deep High-Gloss Finish
The GTX Ultra Aggressive Undertray Add-On is finished with a premium UV-stable high-gloss lacquer, providing:
- Excellent resistance to fading and yellowing
- A rich OEM-style appearance
- Seamless compatibility with other MHC+ carbon fibre components
Fitment & Installation
Required: MHC+ GTX Rear Diffuser must already be fitted.
Installation method: The undertray and corner sections use OEM mounting points, pre-applied automotive-grade adhesive tape, supplied stainless steel self-tapping screws, and M6 nuts and bolts.
Installation time: Approximately 30 minutes.
Difficulty: Moderate — pilot drilling is required.
The recommended installation method is to assemble the diffuser and undertray as a complete unit on the bench before fitting the assembly to the vehicle.
The alignment of the corner sections with the wheel arch is particularly important for achieving the best visual result, so careful positioning is recommended during installation.
All required fixings and consumables are supplied. For the best result, installation should be carried out indoors, above 15°C, on a clean and dry vehicle. Trial-fit the components before committing any adhesive tape.
Professional installation is recommended for the best possible result.
Required Tools
- Drill
- 2.5mm drill bit — supplied
- PZ2 driver bit — supplied
- 10mm socket
- 10mm spanner — required to hold both ends of the M6 hardware
- 8mm socket — for rear bumper corner OEM fixings
- Panel wipe or IPA
- Lint-free cloths
- Alcohol wipes — supplied
What's Included
- MHC+ GTX Ultra Aggressive Undertray Add-On in pre-preg carbon fibre
- M6 nuts and bolts for the diffuser and corner sections
- Pre-applied automotive-grade double-sided adhesive tape
- 4.8 x 13mm stainless steel self-tapping screws
- 2.5mm drill bit
- PZ2 driver bit
- Alcohol wipes for surface preparation
- MHC+ fitment guarantee
- 3-year warranty
Fitment / Compatibility
Requires the MHC+ GTX Rear Diffuser to be fitted.
- BMW F87 M2 N55
- BMW F87 M2 Competition S55
Why Choose MHC+?
MHC+ is recognised for producing premium BMW carbon fibre styling upgrades with a focus on precise fitment, OEM-inspired design, advanced engineering, and exceptional manufacturing quality.
The MHC+ GTX Ultra Aggressive Undertray Add-On completes the GTX rear-end setup with an extended lower aero profile, premium pre-preg carbon fibre construction, deep high-gloss finish, and OEM-quality fitment specifically developed for the BMW F87 M2 platform.
