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hi i have some questions about catalitic converters. do they make straight through cats or do all of them restrict a little if so whats the best flowing. do cats take the place of mufflers. i was wanting to put dual exhaust on my camaro but nobody will do it unless i put on cats so i guess i will just bite the bullet and do it, but i still want the best flow i can get.
 

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The theory behind a cat, is that it superheats the exhaust gasses to burn up unburnt polutants....thus a cleaner exhaust and lower emmisions..

There are less restrictive cats available.
 
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