Well first and for most Hello everyone, I've recently bought a 04' WRX (actually bought in June), I still VERY very new subarus and tuning. I just finished buying a downpipe and a catback, but before installing it someone told me I have to do a tune up. Do I really need to do a tune up? and if so what is a tune up?
- also what would be the best way to have a tune up done.