OK - I just took delivery of my 08' M3 Sedan 6MT this past friday.
I plan on keeping the car 100% stock appart for very minor tweeks here and there.
Only one thing I'd like to improve on is the exhaust note. What would be the cheapest and most economical way of improving the exhaust note? I don't want something too loud or something that sound like a 68 chevy 454... just a more throaty exhaust sound...
Two things I want to keep:
1) discreet sound at cruising speed
2) stock look & keep the stock quad exhaust
Any suggestion for an exhaust virgin?
