COMP Cams Camshaft 03-08 Dodge Non-VVT 5.7/6.4L Hemi Thumpr NSR CamCOMP Cams is bringing the Thumpr camshaft series to the 2003 2008 Dodge 5. 7 6. 1L and 2009+ Dodge 5. 7 6. 4L HEMI engines. The new COMP Cams Thumpr NSR camshafts offer big power gains along with the unmistakable Thumpr idle lope, all without the need to upgrade valve springs. In the past, attaining a racecar idle sound meant swapping to a camshaft that sacrificed low RPM torque. COMP Cams engineers have overcome this dilemma by delivering Thumpr