Designed to deliver an aggressive hard-hitting exhaust note at idle the Thumpr camshaft series from COMP Cams also delivers excellent horsepower gains and a broad torque curve. A perfect choice for muscle cars and street rods the Thumpr series' early intake valve opening and long exhaust duration create optimum overlap for that race car idle. The Thumpr grinds all require an aftermarket torque converter and lower gear ratio to ensure the drivetrain always puts the engine in its powerband. Additionally Thumpr camshafts typically deliver reduced vacuum at idle making a vacuum canister pump or hydroboost a requirement for vehicles running power brakes.