Ford Mustang Forum - View Single Post - rwhp for shelby and roush
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post #13 of (permalink) Old 06-06-2014
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Crak88lx's Avatar
Joined: Jul 2013
Location: grand rapids
Posts: 946
The 15% is for stock cars, generally on average 15% loss to the wheels. We know it's a huge variable but it's a ball park.

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