Four hundred cells per square inch is not what's holding your build back. A high flow cat at ~200 cpsi in a 3 inch downpipe is a rounding error next to your manifold and muffler — and the cat delete buys you P0420, rasp, and a failed inspection. Send it to the test pipe guy. #ThreePieceUS #cars #wheels #highflowcat #catdelete #exhaust #downpipe #p0420 #carmods #buildnotbought