Comp Cams 2005-2010 Mustang GT Modular 3V Mutha 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 2 Mutha' Thumper: Very rough idle, biggest cam for stock heads. Great power above 4900 rpm Compatible with stock valve springs. Requires cam phaser upgrade and custom tuning.