Reviews | Q/A Comp Cams Thumpr NSR camshafts make power from 1,600-7,000 RPM. They are a direct fit for 2011-2014 5.0L Coyote powered Mustang GT's. The Thumpr NSR camshafts feature a grind profile that does not require new springs, keepers or retainers. The Thumper grind profile ha...