Comp Cams 2005-2010 Mustang GT Modular 3V Thumpr cams gives you the sound and performance like a real "hot rod". The Thumpr Series delivers an aggressive thumping at idle and generous power gains.
Stage 1 Thumper: Great idle with excellent power gains. Good mid-range torque & power above 4500 rpm. Compatible with stock valve springs, converter and rear gears. Requires cam phaser upgrade & custom tuning