Ecu and exhaust,
The car doesn't need it
To optimise yours:
Have the front of your seats positioned higher (standard: you feel like sliding off during hard breaking)
Ask for AeroRacing brakepads
Put a little negative camber up front
Semi-slick tires (fine in rain too)
If you don't mind spending on your car: 'new' steering house and diff from +4ss

If you Really want more horsepower: pm me


Steven
sold: M3W, Aeromax,V6, 4/4 4seater
now: +fourLM62