hey im going to put cold air intake, pullys, cams, headers, heads, andexhaust catback. I know that 2.5" piping is the best for my car since im not gettin a turbo but i found a muffler/exhaust tip that i really like but its inlet is only 2.25" wide. With all the mods, how many less horse would i get with the 2.25" piping compared to the 2.5" piping?

 

ive got 2.25 on my h22 accord. 2.5 can sometimes be overkill but with the supporting mods 2.5 will probably work just fine