The LS3 is SAE certified at 426 hp but there is a long tradition of not completely showing your hand in the muscle car wars. With the suspension and gearing improvements alone it will feel like a significantly faster car. The swap from 3.45 gears in the SS to 3.91 will give an equivalent torque gain somewhere in the neighborhood of 15% or 60 lb-ft. That is going to make a big difference.
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