Hey everybody. I have a 2000 gsr and was wondering what's the best header/exhaust combo to use. I don't plan on going fi and will probably mainly just do some n/a mods. Not sure yet as to how much power I want to put to the wheels in the long run but I know it probably won't be anything over 200 or so. The exhaust I'm most likely going to get is the apex N1 and was wondering which header will work best with it, maybe a dc jdm 4-1? Also, I'll probably get a hi-flow cat or remove it all together, what size test pipe or cat should i go for, 2.25" or 2.5"? I want most my power to be in the upper rpm's as long as I don't need to sacrifice large amounts of my low end. Thanks for the help.