COMP Cams Camshaft A8 299THR7 Thumper

Marsoni

M251S

$312.42

Get it in 3 business days with 1 day shipping. Friday, May 29

COMP Cams Camshaft A8 299THR7 ThumperDesigned 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

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I used this as a topper to butyl sound deadening material on the floor and side panels and am very pleased. It was generally easy to use. It is very sticky and cannot be easily repositioned as the foam will separate from the sticky side if you try, but its not a big deal. I have yet to run the car but the panels are much quieter when tapped on vs just the butyl alone, and this stuff weighs almost nothing.

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Reviewed in the United States on February 17, 2026

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Bret Jackson

Dallas, US

★★★★★ 5

Good deadening

Model: 197mil 31 sqft Car Sound Deadening Mat

This sound deadening works well and has good adhesion .

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Reviewed in the United States on May 18, 2026

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Mags

Port Orchard, US

★★★★★ 5

Easy to install and great value.

Model: 197mil 31 sqft Car Sound Deadening Mat

Very easy to cut and install with the rollers I bought separately. It adheres well even though I was installing it when the weather was closer to 40-50 degrees. Definitely helps to deaden the sound from the bare sheet metal.

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Reviewed in the United States on April 2, 2026

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Chuck P

Omaha, US

★★★★★ 1

Garbage

Model: 197mil 31 sqft Car Sound Deadening Mat

Straight garbage, I tried to cut corners on cost of building an spl car and should have stuck with dynamat or something like that. This is NOT for sound deadening…… Garbage product!!!

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Reviewed in the United States on June 5, 2026