My future plans for my 97 GSR are intake, header, exhaust, ctr or itr intake cam and a hondata s100 to tune after installing the cam. I was thinking about getting a JDM ITR 4-1 header or comptech 4-2-1. Which ever one I get is going to be followed by a high flow cat and the same size piping all the way back. I was wondering if 2.5 inches would be too much for the mild mods. Do you think I am better off going with a comptech header instead?