I can't imagine a sprint booster being considered a performance mod. It is a gas pedal mod, not a performance mod. If you want to change the pedal action, great.

A blow off valve? Seriously? If I heard one on the street I wouldn't be able to prevent myself laughing. I looked it up to see who was selling BOVs for BMW models and saw an advertisement that stated "has the ever-popular whoosh sound". Honestly. OK. Do what you like, it is your car.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue