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My understanding is that the foam is simply there to muffle the sound of air being sucked in. Some people think it actually restricts airflow. I don't think any harm has even been done to a Volvo by removing it. The previous owner removed it on my car and i've been driving for 3 years without it.
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1988 760Tic - electric fan,cone filter w/custom heat shield, 2.5" cat-back exhaust, HD radiator, boost gauge, a/f gauge, remote start, BP7ES plugs, brown top injectors,tuned AMM, MBC@14psi - 158,800 1966 M-B 230 sedan - 98,000 1982 Rx-7 - 201,000
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