I have spent a while reading lots of different posts and have just managed to confuse myself.
At the moment, the only mod. i have done tuning wise to my 325 is a free flow air filter. I would like to tune for more power but don't know which way to turn 1st. Exhaust & re-map seem logical but there is lots of ideas out there like an M3 exhaust, 330i inlet manifold.
Can someone give me some relevent advise please.