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  • bmw325 ·
    Does anybody out there have Walker cats on their car? I am thinking mine are very restrictive based on the sound and slightly lowered power. Above 3500 rpm it sort of hisses, like a crushed pipe. They fit well and have no leaks, and the car is otherwise fine, no MIL or anything. I do not think my car could have clogged the cats, but maybe out of the box they don't flow well.
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