current set up is a poor mans type r, pr3 pistons, ctr cams, stock cam gears, p2t ecu. so car is untuned right now, has an aem intake, some no name egay header and 2 inch exhaust, no resonator, no cat. for some reason the last owner put 2inch exhaust on instead of like 2.5 or something. What i'm wondering is if its worth it to put on a JDM itr header, omni man test pipe, and 2.5 full exhaust on. Will i notice any big gains? if i did do that, after so i'd just get some cam gears, a p28 with harness and get the thing tuned. what kind of power could i put down? Thanks guys for helping me out