i own a 93 hb w/gsr motor w/jdm 4-1 itr header can someone please tell me how long the cat or test pipe should be and where to get either items thanks

 

I'm not sure how long it is, but take it to a muffler shop. They won't make you a test pipe because its not legal, but where I went they had catco universal cats, and I got a 2.5". But who knows, if you throw them a lil extra, they might make you a test pipe. I think http://www.landspeedracing.com has them too.