JB4 N54 2 STEP / NLS Relay a8 d5 This high-performance upgrade optimizes engine

This high-performance upgrade optimizes engine performance and sound

Optional: For Extra Ordinary Performance with JB4 We also recommend Our S63 Downpipe

Power Gain With RS (+31hp/+24tq)

Intercooler (add on)

compatible with all 4

JB4 N54 2 STEP / NLS Relay a8 d5 This high-performance upgrade optimizes engineJB4 N54 2 STEP NLS Relay This add on kit for BMW N54 engines allows your JB4 to "2step" the engine (cycle power to the coils) to build boost when not under load. Useful as both a noisemaker for both manual and automatic transmissions, and for launching with manual transmissions. It also allows No Lift Shifting (NLS) for manual transmission cars. The relay kit requires a JB4, back end flash map, and BMS data cable or JB4 mobile connect kit. Note that