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Mine is an LS3 but just for reference, I had a tune from Steve on my car for cai, and headers w/ high flow cats. I later took the car to be dyno tuned and they weren't able to pickup any more power. Settled at 425rwhp and 419rwtq. Needless to say, Steves tunes are great!
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2014 1SS/RS LS3 AGP TT, Custom TSP Cam, 4L80E Swap 1/4 mile- 9.53 @ 145mph
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