+1 to this. I had Stillen exhaust and intakes before my UpRev and it was still running really rich, so you'll be fine. For comparison I've heard a stock car is about 270WHP, w/Stillen exhuast 290WHP, w/Stillen exhaust + intake 300WHP and w/Stillen exhaust + intake + remap 310WHP (Colin also got 310WHP with Stillen exhaust and remap). So remap definately worth it but you'll have a good chunck of new power without it