I have a 2000 jdm type R that came with a full Mugen sports exhaust system.
the piping from the header to the resenator is 2 1/4 inch and pass the resenator is 2.5 inches all the way to the muffler .
Do u all think the 2 1/4 piping is 2 restrictive :unsure:
2.5 isn't too big for NA, if you have some larger cams and pushing hard uptop then 2.5 is very nice, you tend to loose a little bottom end grunt for the top end gains.
nah, the 2.25 resonator (which i think you mean test pipe) is fine.
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