F Chassis N63tu stage1 Tuner - 2013+ 650i, 750i, 2014+ 550i and 2014-2018 X5 50i modelsThis 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 N63TU motors. Stage1 gains on the N63 are up to 40whp range on pump gas and up to 60whp range with the n63tu motor. With exhaust modifications and or on racing fuels even higher power levels are possible. Don't pay 10x