Right now my car is BONE stock, but, after getting the basic supporting mods (180*tstat, Downpipe, CAI, colder plugs(should I run TR55s or TR6s?) etc) Ive heard other people say I need to run .1 size bigger because I have an '04. Its not a Series 3 and doesnt have a Gen V on it, so I thought I could follow the same parameters when it comes to modding as a 99-03 GTP? Am I missing something here?