Yes, I did. I decided I wanted to go to a full 3" catless setup in preparation for the new turbo. When I made the swap I was still on the stock turbo, with E85, making close to 350WHP. I did not see any measurable change in power after switching to the Q300 and catless downpipe, and I actually think the SPT exhaust sounds better. It is all preference, but I don't see any reason that someone wouldn't be happy with the SPT, and I don't think it is a restriction unless you're going for huge power.