I've seen tests and usually when they say 150HP shot, they are correct and they get exactly 150HP. I'm wondering...

My 383 hits 456HP @ 5400 rpm
------------477ftlbs @ 4500rpm

Will the maximum HP @ rpm range move up or down?

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moving to the power adder board, they should be able to help you more over there.

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ICON Motorsports
1st & 3rd