RM ENGINEERING RACE
RM Engineering GT4+ Splitter Kit For F8X M3/4
RM Engineering GT4+ Splitter Kit For F8X M3/4
SKU:DRMGT4PLSFSF8XR11
- 1X GT4+ Carbon Front Lip/Airdam
- 1X GT4+ Tunneled Front Splitter
- 1 Pair Chassis-Mounted Brackets
- 1 Pair Splitter Center Support Rods
- 1 Pair Aluminum Side Skid Block
- 1X Aluminum Center Skid Block
- 1X Complete Installation Hardware
Couldn't load pickup availability
WARRANTY POLICY
WARRANTY POLICY
Warranty & Inspection Policy
All products must be carefully inspected within seven (7) calendar days of delivery.
Any claim involving damage, defects, missing parts, or incorrect items must be submitted within this seven-day inspection period. Claims made more than seven days after delivery will not be eligible for warranty coverage, replacement, return, or refund.
Customers are responsible for inspecting the product and confirming that it is correct, complete, undamaged, and suitable for the intended vehicle before installation.
Products must not be installed if any damage, defect, fitment issue, or missing component is discovered. Please contact us before proceeding with installation.
Once a product has been installed on a vehicle, it is considered accepted by the customer and is no longer eligible for warranty coverage, return, replacement, or refund.
By purchasing and installing our products, the customer acknowledges and agrees to this Warranty & Inspection Policy.
Quick Answer
The RM Engineering GT4+ Front Splitter Kit is a chassis-supported aerodynamic system for the BMW F80 M3, F82 M4 and F83 M4 Convertible. It combines a carbon fiber front lip with a tunneled splitter, reinforced mounting structure and aluminum skid blocks for track-focused and high-performance street applications.
Vehicle Fitment
- BMW F80 M3 Sedan
- BMW F82 M4 Coupe
- BMW F83 M4 Convertible
Please confirm your bumper configuration and existing front-end modifications before ordering.
How the GT4+ Front Splitter System Works
Inspired by the BMW F82 M4 GT4 race car, the GT4+ system combines a carbon fiber front lip and airdam with a tunneled lower splitter and chassis-supported mounting structure.
GT4+ Carbon Front Lip and Airdam
The reinforced carbon fiber front lip creates a continuous transition between the factory front bumper and the tunneled lower splitter. When installed as part of the complete system, the lip and splitter form a two-piece front aerodynamic assembly.
GT4+ Tunneled Front Splitter
Molded tunnels are designed to manage airflow expansion beneath the splitter. An integrated channel also provides an exit path for air discharged from the factory lower oil cooler, supporting more controlled airflow through the front cooling area.
Chassis Support and Skid Protection
Chassis-mounted brackets and center support rods reinforce the splitter assembly rather than relying on the front bumper alone. Included aluminum side and center skid blocks help protect high-contact areas underneath from pavement, curbing, driveways and track surfaces.
Track-Proven Development
The GT4+ system was developed and tested on road-going BMW F8X vehicles equipped primarily with bolt-on modifications. Recorded testing was completed without extensive vehicle weight reduction and on 275/35R18 200TW tires.
Recorded F-Chassis Results
- WeatherTech Raceway Laguna Seca: Best recorded lap of 1:34.341
- Global Time Attack Finals at Buttonwillow CW13: Fourth place with a best recorded lap of 1:50.940
- Super Lap Battle 2025 at Circuit of the Americas: Fastest BMW in class
These results provide real-world development context rather than guaranteed performance outcomes. Actual performance depends on vehicle setup, ride height, suspension, tires, alignment, track conditions and driver input.
GT4+ Front Splitter in Real-World Builds
See how the GT4+ Front Splitter Kit is installed and used on two track-focused BMW F8X builds:
- BMW F80 M3 GT4+ Time Attack Build — Alex’s F80 M3 combines the GT4+ front splitter system with a complete track-focused aero, braking and chassis setup.
- BMW F82 M4 GT4+ Development Car — Ridgeline Motorsport’s F82 M4 shop car was used for GT4+ aerodynamic development and Time Attack testing.
Installation
Installation requires modification of certain OEM components. Review the complete PDF guide and both installation videos before beginning the installation process.