Originally Posted by ImPreSiV

Tommy, the cat back comes with an oval muffler, not the canon, like on the turbo back. And as far as Dylan is aware, the second part of the cat back does not match up with the front half of the turbo back, so they are not interchangable... Something to do with the pipe joining in different parts under the car.

However, I had a "Dylan Spec" cat back exhaust on my 02 sti, and I had the canon rear end, so it may be able to be done... Might just take some research and test fitting...