Originally Posted by biz77
Ransom, there would be no reason to switch back to a stock tune for emissions testing. That Cobb downpipe may pose a problem in CO, however. What year is your car? If 05/06, you probably want to swap out that up-pipe as well.
I have an '07 Spec B so the up-pipe is not an issue. Wouldn't throwing the stock DP back on with the stage 2 tune still in place be a problem? I mean they really push the car on those dynos last I saw and the tune wouldn't account for that terrible bottleneck, would it? Don't want to hurt my baby