So I called this muffler shop asking if they would switch out my cat for a test pipe and the dude poped an attitude saying its a against federal law or some b.s, but I looked under my car today to see how it would work out with the test pipe and I dont think it will. I have the Apexi N1 turbo back exhaust and rite where the down pipe connects to the rest of the exhaust is ok but if I was to change out my cat I would have to cut the pipe because theres no other connection until after the 90 degree turn. Unless if I get the piping and get it bent like the original. Does anybody get what im sayin?