It should be noted that Shumbys car is a 7 AT. The car that GTM used was a 6 MT. There will be a few extra rwhp as the difference of loss in the transmisions.
I would expect his car to make 416.76 rwhp @ 8 lbs.
Z
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 12.343 @114.14 . 4.5 stroker motor is now being built. Dec 1 2015.
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