Ok I have a Gsr turbo'd with CP 9:1 comp pistons, Eagle H beam rods, Walbro 255, 3 Bar map, RC 550's, SC61 turbo, Neukin ramhorn manifold and 3" downpipe, Tial 38mm wastegate, AEM EMS. Now my question is I had my car tuned with a inline pro cast manifold and 2.5 inch exhaust..I upgraded to the...