I have tried OE, K&N and without on a dyno and came out with 160hp, 164 and 167 respectively. As far as larger material passing through, without specs on the OE units who knows. But at 211,000 miles on a gas motor it can't be to bad.

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Darryl, Hill
2005 SL55 AMG Kleemanized
1984 500 SEC
1967 W113 California Coupe
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