ah, a common misconception. a hollowed out cat doesnt change the air flow path of exhaust gasses. a highflow cat has the same flow pattern as a hollowed out cat. the exhaust gas on both enters a wider area, and exits into a narrower area. i dont think the hoserpower between a stock cat, a hollowed cat, and a high flow cat is enough to even change a dyno within its error margin.
what is a difference, is hollowing out your cat because, in my case, it was clogged.
and as far as emissions go, my car probably still emits 20 times less emissions than a mid 60's vw bug thanks to modern fuel injection and advances in engine design.
what is a difference, is hollowing out your cat because, in my case, it was clogged.
and as far as emissions go, my car probably still emits 20 times less emissions than a mid 60's vw bug thanks to modern fuel injection and advances in engine design.
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