Well I am in the market for the HMF full dual high mounts and will be getting a PCIIIusb with it also (I think that is the one I need). Also getting the muzzy fan. Is their any thing else that I need to do like the pair valve or an air box mod? I do not do any racing other that little runs here and their with friends. So any help would be helpfull. Or what are the pro's and Con's of doing the extra mods with this exhaust.