Originally Posted by Cal@Sonic MS
A full catless setup such as RPI's GTM race exhaust system utilized in conjunction with RPI's Ram Air Induction Kit would yield approximately 40hp. Couple this with a tune such as Evolve and you should see at least 55hp gains when compared to stock.
Pulleys are a relatively cost effective mod that will yield another 8-10hp or so. I would suggest RE or AA.
So only 15hp? I would think evolve would be able to give me a more aggressive tune because I would be cat less, thus giving more gains than on an otherwise stock car. Or am I wrong?