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Corsa does not make a system for the L98, which is what I believe you have. A couple of forum members have adapted the LT1 Corsa exhaust to L98's, but I haven't heard of anyone whose done it and kept a catalytic converter. You might need that. (The cats on the LT1 are in the place where the pre-cats are for the L98, and there is no Y-pipe.) I'll be eager to hear if you get any more positive response than this, cuz I've wanted to put a Corsa system on my car too.
Where can I buy a Corsa exhaust system for my 89. Do they make them for my car????????
They do not.
You can use the system though. You will need a shop to help you out, it's not complicated though. If attaching to a stock system, you will need to cut into the front y-pipe and install a bullet style cat on each side. Out of each cat, you will need a custom "S" bend to feed into the resonator. From there on it's no problem, resonator to muffler. You can order the exhaust hanger brackets from 92-96 Vettes or have the shop make brackets.
Where can I buy a Corsa exhaust system for my 89. Do they make them for my car????????
While Corsa doesn't actually build a kit for your car. You can get one for a LT1 application and purchase all the LT1 hangers from a dealer. It is a piece of cake to install. I did a B&B system for a forum members car which was also a 89 with a 6 Speed tranny. I just purchased the exhaust hangers from GM for a LT1 engine and it all bolted in. The only fitment issues you would have is connecting to the stock exhaust in your car. The one I did for "thetoy" was relatively easy as he had long tube headers and I made the connections to the collectors. The rest of it was just bolt on and go.