I have a 5-zigen full cat back exhaust that was on my 2000 gs-R coupe. It is a fireball muffler with 2 1/4 inch mandrel bent piping done by one of the best shops here in Arizona. Superior Racing Development. only minor scraps on the underside of the exhaust from when I removed it from the car and it scraped along the ground a bit. I payed a total of about $500 for the muffler, piping, welding, and install. i am looking to get $300 + shipping. Let me know if anyone is interested. Thanks.