which are the best exhaust, air filter options for the M3??
I wanted to know since its the first time I'm planning on spending some cash on mine, which exhaust is better for the price, borla, remus, supersprint, Mgruppe,etc. What about the ait filter, AFE, K&N, Mgruppe, etc. I want you guys who already bought this products before to help me out deciding what is best for my car, I want increase performance and for a reasonable price, the best under 2K and above 2K, and if helps to change x pipe, resonator, I have no idea will it make a difference? I just saw the supersprint headers for the new M6, they where 7k, thats too much, but the rest was affordable. I know its a lot of questions, thanks anyway. Or maybe a chip tuning?