ok fellas i have a jdm b16a with s2 manifold ctr cams and some tri y headers with 2.5" outlet on my 93 si... what i wanna know is what size piping i should run with cause at the moment my triy seems to be longer than the stock headers and goes halway pass the cat so it's about 1feet off from the piping.. as of right now im thinking about what size to use 2.25 or 2.5..please let me know thankyou