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In responce to gutting a stock cat and leaving it on there, it creates more turbulence and thus is more restrictive. That's why that Miata showed crappier performance with a gutted cat instead of the straight pipe.
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*TOTALED* - 2000 Olds Alero Sedan - 3.4L 3400 V6 - WAI - Sony Head Unit -
NEW RIDE - 2005 Buick LaCrosse - 3.8L 3800 Series III V6 - WAI - Muffler/Resonator removed -
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