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From: One day you're a Comet...the next day you're dust... Arkansas
The exhausts are totally different. On my 1989 I eliminated the precats, put in a Magnaflow (Carsound) highflow main cat, and installed a Magnaflow OEM style aluminum catback. www.corvettecentral.com
The performance is much better and not much resonance. Price was right.
Someone else will need to address the LT1. I think most people just install a catback.
my 86 has a little rumble to it. the setup is stock maifolds into a cat converter and then strait pipes out the back. pretty basic and moderate sound, if thats what yr lookin for?