[89IROC&RS]

well exactly, from the cat back to the muffler it is a single pipe. then two pipes come out of the muffler. so if you are xing out the muffler, it would be a single pipe system. unless you split the pipe on a custom job. for your price i would look into dynomax. i have a 180$ system on my RS, not very loud, but a very deep mellow sound that gets lots of compliments.