Pay in 4 interest-free payments of $99.88 Learn more
Ships within 48 hours · Estimated delivery Aug 25 - Aug 30
Overtaking cars on the highway does not require a downshift anymore
Direct bolt-on installation
9kW at 5300 rpm
finally allowing you to hear your turbo spool up under heavy acceleration
BMS JB4 Tuner BMW G8x M3/M4 S58 3 series downpipes Overtaking cars on the highwayGains are 80whp 100wtq on pump gas and up to 150whp 175tq on higher octane or E85 mixtures. The ultimate tune for your S58 powered G80 M3 and G82 M4, the JB4 allows you to go from factory stock to full race, and everywhere in between. The JB4 installs and removes easily and includes many unique features not found in any other tune including user adjustable 1st and 2nd gear boost limiting, smartphone integration, electronic wastegate control, ethanol
