So I got to take my s4 turbo II around the block yesterday for the first time. Ofcourse I hit boost a couple of times, but I only hit 8psi and never hit the boost/fuel cut. I was kinda worried I would hit it since I have a 3in test pipe and downpipe. I am however running my old HKS catback which is dual 2in. What do you guys think is the catback holding it back just enough not to hit the cut?

mods are 3in downpipe, 3in test pipe, dual 2in hks catback, 3in TID, walboro 255, and k&n filter