ok again i have a 95 integra, and i put a 97 jdm type r b18c motor in it. i have gsr tanabe cat back exhaust, but the type r header and downpipe (a-pipe) is bigger so i cant use it. So i can i use a stock gsr header and stock gsr a-pipe? or will it be oo restrictive? please someone help

 

It won't be incredibly restrictive, but it will be restrictive. Best bet would be to get a new exhaust. Almost as good would be to take it to a muffler shop and have them cut off a few inches and weld a reducer/expander on the tanabe so that it bolts up to the itr header. A cheap shop should to it for like $40.