89 Iroc 5.7 L98 single cat Bor-14888 with a cto-9118 cat this should be a bolt on project according to the info given by summit an borla. an for the price it should be,, I have emails to both asking for a solution I thought I would give them a chance first borla responded with need more info an they would check to see if I have the right system so I gave them more summit hasn't gotten past the auto response I thought I would give the info here for others the cat back does not have a stock flange at the cat they do have 3 diferent pipes to fit other size slip fit cats but not my beloved L98's this just does not make sense to me,,,, lets make it fit the smaller ones not the biger ones any subjestions I like the system so I will make it work I just feel they need to fix there info or fix the problem,,,,,Borla states there's is a bolt on no mods fit return cat for a slip fit an hope it fits take it to a shop an have a flange put on

got a response if I would have known this I don't think I would have bought it,,,,,seems a little high priced to have these problems,,,,I don't have my old pipes so I will have to fab it up to much money for all this in my opion

Thank you for contacting BORLA PERFORMANCE. This is the correct system for your vehicle. Our system is not designed to bolt up to your cat. You will have to cut the pipe after the cat to install this system with the parts supplied in the box. If you have additional questions regarding Borla exhaust check out our web site www.Borla.com you may contact me Direct anytime Mon-Fri 8:30-5:00 PST with questions or concerns

Regarding our products.