I was looking at doing this upgrade in stages; do the corsa and see how i like the sound etc., save up a few more bucks and if I want more sound and get rid of the hot second cat, then do RTs, but the only way to do that strategy is to go 2.5". Corsa lists 15hp and 20tq increase for their track system, with no differencce listed for the 2.5 versus 3", also I'm told the header he out;et is 2.5" so if I don't change headers, which I won't, I wouldn't think there'd be a significant diffeence in hp between the 2.5 and 3.
Dave
- I am working on quotes from JonB.