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Can't awnser for LS3 but my L99 is very smooth. Wish I could awnser better but heard a LS3 at dealer and it sounded very smooth but they only had it running for maybe 2mins. They turned car on and reved it for me cause I Was buying one but had never heard the V8 run. Had only test drove the V6 which had impressed me. Very good power for V6 but it's no comparison to the V8 but it's nothing to be ashamed of because it was very stought!
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