This 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 & S63 motors. Stage1 gains on the N63 are in the 30whp range on pump gas while gains on the S63 are in the 50whp range on pump gas. With exhaust modifications and/or on racing fuels even higher power levels are possible. Just connect your laptop using a BMS USB cable to raise the boost levels when on race gas. Don't pay 10x more for functionally identical piggyback systems or big name flash tunes that claim more power but put down slower times at the track.
For the latest tuning information and updates be sure to check in to this thread: http://www.n54tech.com/forums/showthread.php?t=18035