Anybody else surprised by this? I mean - with the STi putting out ~73hp more at the crank than a regular WRX, you'd think the STi turboback would be better in some way?Originally posted by Mattr762
There is very little to no advantange to swapping out for the STi turbo-back. It still has 2 cats and is 2.25" in diameter just like the WRX.
If it's the same diameter, is there something else different about it?