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well most 5.0s that I know have tunes and a few boltons. To put it in perspective, they gain nearly as much power as we do from a tune. I see plenty running 115-117mph traps.
The ZL1s are hit and miss, yes they are supercharged but they are extremely heavy and only barely faster than a stock 5.0. They also suffer from heatsoak REALLY bad so on the street they may be even slower.
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'08 E90 w/ just boltons
'09 Z4 sDrive35i w/ just boltons
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