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All we have is our personal experience with a few local cars, all making 600+hp on stock l99s with no issues. Killmodes car has been making ~700rwhp for 12k+ miles without a single issue so he has a factory freak car, or just a decent tune.
Maybe a lot of it has to do with turbos. He makes stupid power on low boost, with very little timing. It maybe easier on the motor compared to s/c. The turbos are so efficient it doesn't take much boost or other mods, and only ~8 degrees of timing to make 700.
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Nick
Corvette Z06 -1200ish rwhp
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