I have a B18C1 with the DC sports race header , 3 angle valve job, and AEBS Intake manifold ALL MOTOR is the route im staying with. This is a daily driver for me but I still want the most power squeezed out of it and wanted to know what is the best size to go for 2.25 or 2.50? Reason I have asked this question is because I see alot of people with 2.5 off of the race header but I thought it needed back pressure for power and wanted to know shouldn't I run 2.25 for back pressure for this simple setup? Thanks