FWIW 424 rwhp comes out to 498 bhp or crank hp by my calculation.
I think 424 rwhp @ 8 psi is right where you would expect to be.
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Whipple @ 9 psi - 445rwhp/400rwtq - 12.07 @ 118.7 mph
Steeda sport springs - Steeda strut mounts - Steeda TriAx- Steeda Adjustable Panhard Bar - Steeda Axleback - D-Spec shocks - J&M LCAs - FRPP 4.10s - GT500 spoiler -
And probably more I can't remember
All work done by owner
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