I've almost got enough money saved for my tune although my tuner wants a deposit of around $150 I think he said I'm almost there just $200 short for the initial tune that doesn't include the deposit. Anyway I ordered a catless dp and a catless up pipe about a month ago haven't installed it yet cuz I wanted to get it tuned my question is a tune really necessary for a 02 wrx? If not what will I be missing out on without the tune? If I was to just slap on the catless dp and up pipe would I be slacking on whp? What I want when I install this dp and up pipe is noticeable gains in whp that fun feeling we all felt when we weren't used to stock WHP (If you know what I mean kinda hard to explain) Basically I just want a REAL noticeable gain in power. If slapping on the dp and uppipe without a tune wont do that I heard it will gain anywhere up to 50whp from a tbe exhaust is that with a tune?