An 05 is an LS2 which run "okay", but they aren't near as strong as the 2008+ LS3 cars. My comment was steered more towards a Z06/ZR1. A stock Z06 is a easy mid 11 second car with a mediocre driver. In the hands of a great driver they will run high tens - stock. A Zr1 is just that much more of a monster to deal with.
You should be able to beat your brothers car if his is stock and your slightly modded.
2012 Brembo GT, 3.73, 6 speed standard, Airraid CAI, Bama 93R tune, steeda sports, koni str.t, GT500 strut mounts, Flowmaster hushpowers
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