I believe this is the most cost efficient way to add performance to the M3 if you are looking to rival the c63 AMG's straight line performance:
- Apex Arc-8 Wheels - approx 5lb reduction to each wheel and 10.5 inch rims in the back (traction matters and the reduced wheel weight will make a difference) - $1300
- Turner Test pipe (good for at least 40hp with Evolve tune and not just all top end) - $400 + install
- Evolve Tune (great gain across the entire power curve) - $999
- Aftermarket Air Filter (proven for a few hp and considering it is cheap, why not... especially if you are running the stock charcoal filter the 08s and 09s came with) $150
- Power pully (cheap and proven power) $500