I've got a 2000 GTP with an L26 block, NIC cam, 105# ZZP springs, Open Cone, Street tuned (a little on the rich side), AL 103s, 3.5" MPS, SD headers, ZZP flex, Magnaflow high flow cat, Res Delete, and leads into stock mufflers in the back. I get right around 8psi, at the max 9, and I was told by...