i have a 96 civic ex coupe with a 97 jdm gsr engine in it, for an exhaust to fit the downpipe from the acura engine, do i get a honda civic cat back exhaust or an acura integra gsr cat back exhaust? my stock cat did not match the flange on the gsr downpipe flange, so i want to make sure i dont get the wrong exhaust

 

think of it as having an EM1 or 99-00 Si b16a. Most b-series headers are the same length - though you may need to have your exhaust extended or trimmed accordingly.

And dont forget to put a cat on.

 

You're not going to get the answer you want w/this technique of enquiry.