RM Engineering GT4+ Wing For F8X M3/4

Engineered for Maximum Performance. Inspired by BMW Motorsport. Proven on Track.

The Ridgeline Motorsport GT4+ Aero Kit is our most comprehensive aerodynamic package for the BMW F8X platform.

Developed from the visual and aerodynamic foundation of the BMW F82 M4 GT4 race car, the GT4+ system evolves beyond the limitations of the original GT4 rulebook. Each component was redesigned using real-world track experience to increase aerodynamic performance while maintaining a balanced relationship between front and rear downforce.

Designed for serious track-day drivers, time attack competitors, and high-performance street builds, the complete GT4+ package combines a reinforced front lip, tunneled front splitter, GT4 canards, and a chassis-mounted rear wing into one integrated aerodynamic system.

Vehicle Fitment

Designed for compatible BMW F8X M models, including:

• BMW F80 M3 Sedan
• BMW F82 M4 Coupe
  

Please confirm your vehicle model, bumper configuration, trunk configuration, and competition-class requirements before ordering.

Track-Proven Development

The GT4+ Aero Kit was developed and tested on road-going BMW F8X vehicles equipped primarily with bolt-on modifications.

Testing results were achieved without extensive vehicle weight reduction and while using 275/35R18 200TW street-class tires.

Recorded F-Chassis Results

Super Lap Battle 2025 — Circuit of the Americas

• Fastest BMW in class, excluding two Toyota Supras

WeatherTech Raceway Laguna Seca

• Best recorded lap: 1:34.341

Global Time Attack Finals — Buttonwillow CW13

• Fourth place
• Best recorded lap: 1:50.940
• Fastest BMW in class, excluding three Toyota Supras

Real-world testing, competition use, and continuous development remain central to every Ridgeline Motorsport aerodynamic product.

GT4+ Chassis-Mounted Rear Wing

The GT4+ Rear Wing uses a redesigned chassis-mounted support system developed to address the potential water-leak concerns associated with the original GT4 trunk-mounting configuration.

The mounting system maintains structural support while allowing aerodynamic loads to be transferred through reinforced mounting locations.

The GT4+ wing foil is larger than the OEM GT4 wing because it is not restricted by the original GT4 vehicle regulations. The increased surface area is designed to generate additional rear downforce while maintaining an efficient aerodynamic profile.

Rear Wing Features

• Chassis-mounted rear wing system
• Redesigned mounting solution
• Developed to reduce the risk of trunk water intrusion
• Larger wing foil (1600mm) than the OEM M4 GT4 wing
• Increased aerodynamic surface area
• Designed to generate additional rear downforce
• Maintains structural rigidity under aerodynamic load
• Installation hardware included