For '99 the SS's recieved a different stock exhaust set up .In '98 the SS had a single outlet exhaust that had a 3.5 in. tail pipe which exited out the left side of the car.Apparently, this system proved to be louder than GM wanted so they switched to a dual exhaust look.The SLP dual-dual exhaust was the same as in '98,which required RPO Y2Y to get the SLP options.
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