You will have to change the cam for a more aggressive one if you want a different sound and choppy idle. The Weapon X cam is good and Vengeance Racing has a good one too. Your LS3 in your C6 Corvette is a different beast than the LT4. Obviously it has been modded to get 650 hp and our LT4s have 650 hp from the factory and were designed to run smoothly and get decent gas mileage with the supercharger. You could do what many ZL1 owners here have done and get a package deal from Weapon X, Vengeance and other companies with the cam, headers, other parts and of course tuning to get your ZL1 to the next hp level.
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ZL1 Coupe, PDR, Exposed carbon fiber hood insert, My Link with Nav, M6 6 speed and Silver Ice Metallic. Mods done: ceramic window tint, GM Accessories Camaro floor mats and Roto-Fab CAI.
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