sorry, tried posting in technical forum, but its not working. I've never bought an aftermarket exhaust before, let alone a used one. I'm thinking about MattZ(converted TT)'s Borla. It would be on my 90'NA. He says its 2 years old and in good condition, asking $450. He also offered to install it for me. My stock exhaust has rust and is starting to fall apart.(I already lost one of the tailpipes). Any advice would be appreciated. What should I look for? I was thinking originally about HKS HIPER, but well, look at my screename. Thanks in advance!