N63 & S63 Stage 1 Tuner for F & G Chassis BMWThis plug and play tuner attaches to sensors in the engine bay and works with your factory DME tuning to remap your boost, timing, and fueling for optimal performance and reduced turbo lag. It's designed specifically for the N63 and S63 motors. Stage1 gains on the N63 are up to 40whp range on pump gas and up to 60whp range with the S63 motor. With exhaust modifications and or on racing fuels even higher power levels are possible. Don't pay 10x more