BMW N54 JB4 Performance Tuner - 135i, 335i, 1M, 535i, X6, Z4 M235i (F23) lowering the effective octane

lowering the effective octane

with no core charge—just a new pump

and intriguing looks

Premium Air Filter: ISO 5011-certified filter captures up to 99% of dust and debris

An F30 N55 Downpipe is regarded as the best hardware upgrade to get the most power from your N55 powered F-Series BMW

BMW N54 JB4 Performance Tuner - 135i, 335i, 1M, 535i, X6, Z4 M235i (F23) lowering the effective octaneHow about up to 80hp to the wheels (100hp crank) on a completely stock car, up to 160hp to the wheels on factory turbos, or up to 350hp to the wheels on a fully modified car with larger turbo(s)? The JB4 includes a simple plug and play installation harness and is compatible with all ECU versions and transmission types. It's everything you need to take your N54 powered vehicle from mild to wild. In addition to several performance maps which can be