Ok so I have a 04 WRX... I wanna replace the UP because I have been told that they are catted and can break down and cause all those yummies to go into your turbo(Correct me if Im wrong on that).
I was looking around on RallyDirect and in the description for one of the GrimmSpeed Uppipes, they claimed an extra +10whp and also claimed it was one of the best $/Hp gain ratios you could do to your car. I guess that leads me to a few questions...
1. Is this true for the extra +10whp?
2. I have the COBB AP Stage 2 93 tune so am I have gonna have to get it protuned to see any of that extra whp? Or is it just gonna "adapt" so to speak and just free up a couple extra ponys?