Unlock 600HP in Your F8x BMW M2C/M3/M4 with This Simple Bolt-On Tuning Package! JB4® 600 Horsepower S55 Package Get up to 600 horsepower while saving time and money with this easy-to-install package.
Horsepower gains depend on fuel used. S55 BMW DYNO RESULTS Our testing on a stock BMW M4 with the BMS 600HP S55 Package showed peak power gains of over 100HP and 120 lb-ft of torque at the wheels.
