Ridgeline Motorsport
RM Engineering GT4 Canards For F8X M3/4
RM Engineering GT4 Canards For F8X M3/4
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Ridgeline Motorsport GT4+ Aero Kit
Engineered for Maximum Performance. Inspired by BMW Motorsport. Proven on Track.
The Ridgeline Motorsport GT4+ Kit is our ultimate aero package for the BMW F8X platform—developed using the aesthetic foundation of the OEM M4 GT4 and evolved beyond GT4 rule-book limitations. By redesigning every component around real-world data, we’ve created a package that produces significantly increased downforce.
Designed to comply with GTA Street Class and GridLife Street Mod regulations, the GT4+ Kit brings professional-level aero to the enthusiast and competitive driver alike.
Proven Track Performance
The whole Kit is designed to optimize performance for vehicles with bolt-on molds only. The test results are based on Road Going F8Xs with no weight reduction with 275/35/R18 200TW Street Tires Only. F-Chassis Testing Results to Date:
SuperLap Battle 2025 – COTA
(Fastest BMW in class, excluding 2 Supras)
Laguna Seca: 1:34.341
Global Time Attack Finals – Buttonwillow CW13: P4 – 01:50.940
(Fastest BMW in class, excluding 3 Supras)
Real results. Real podiums. Real validation.
Included Components
OEM GT4 1:1 Canards
Exact GT4 geometry for improved front-end bite and increased mid/high-speed stability.
Why Choose the GT4+ Kit?
Inspired by BMW Motorsport, engineered for maximum performance
Increased downforce front and rear
Balanced aero for serious track performance
Legal for popular street-class time attack series
Modular system—purchase as a full kit or individual components
Notes
Full kit recommended for best aero balance
All hardware included
Splitter skid blocks optional
Professional installation recommended
Installation Info:
GT4+ Splitter Installation PDF:
https://ridgelinemotorsport.com/blogs/installation-guide/gt4-splitter-install-guide
GT4+ Kit Installation Video:
