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Old 05-29-2012, 04:38 AM   #8
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Join Date: Feb 2008
Location: Philadelphia
Posts: 6,919
My Ride: M3 & ZHP
Not surprised. I would imagine the intake manifold and/or the head itself are larger bottlenecks in most cars. The only car I've seen a filter make a big increase was the mazdaspeed 3
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