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The claimed "sub 3 seconds" was accomplished with the Z51 package. There's been several reports that the sub 3 second has equated to a 2.8 sec. The Z51 package offers a 3.80 ratio E-diff versus the base car's 3.61 ratio limited slip. Also responsible for the better time is 5 more HP/torque (accomplished with true headers and bi-modal exhaust) and much stickier tires. The rest are better brakes, a HD cooling system, spoiler and splitter.
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