RM Engineering GT4+ Splitter Kit For F8X M3/4

Ridgeline Motorsport GT4+ Aero KitEngineered 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.

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Proven Track PerformanceThe 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: 1:34.341Global Time Attack Finals – Buttonwillow CW13: P4 – 01:50.940
(Fastest BMW in class, excluding 3 Supras)Real results. Real podiums. Real validation.

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Included ComponentsGT4+ Front LipA reinforced, GT4-inspired design that creates a sealed front plane when paired with the splitter.
Can be used without the splitter, though lifespan will be reduced.GT4+ Tunneled SplitterTwo-piece lip + splitter systemIntegrated airflow channel for the lower oil cooler1-piece molded tunnel for increased downforce and rigidityOptional aluminum skid block kit (+$99)Includes all hardware; minor OEM chassis modification required

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Why Choose the GT4+ Kit?Inspired by BMW Motorsport, engineered for maximum performanceIncreased downforce front and rearBalanced aero for serious track performanceLegal for popular street-class time attack seriesModular system—purchase as a full kit or individual components

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NotesFull kit recommended for best aero balanceAll hardware includedSplitter skid blocks optionalProfessional installation recommended

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Installation Info:GT4+ Splitter Installation PDF:https://ridgelinemotorsport.com/blogs/installation-guide/gt4-splitter-install-guideGT4+ Kit Installation Video:https://www.youtube.com/watch?v=eeoQ4eUPWqEhttps://www.youtube.com/watch?v=9hb8qY5Lxf0