I have aquired a cat back for an crx and was wondering if it was any different from my 89 civic si. I know they look identicle but are they really. how can I make it work on my hatch si. thanks

 

The length of the B-pipe is going to be longer for the Civic than the CRX. You will probably have to add a few inches to it. Or if you get a testpipe/hi-flow cat, you may be able to find one that is slightly longer and pick of the slack there. The tailbox (muffler) sections should be identical on the EF/ED cars.

 

Additionally, the hangar location on the B-pipe might need bending or relocation.

 

thanks for the input. Thats what I thought...