If the rule of thumb is 2.2 cfm per 1 hp (best guess I found doing a few searches) you would need 770 cfm for a 350hp engine to free flow. That would be two cats, since one 3" unit (even the least restrictive ones) seem to top out in the 500s.
I guess if there is backpressure from the mufflers I guess it does not matter? And I do not doubt that there are fast cars out there running on a single cat. But is that optimal or just not robbing enough to matter?
http://www.eng-tips.com/viewthread.cfm?qid=104735
http://www.superchevy.com/technical/...xh/index1.html
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Originally Posted by Lts1ow
Granted that thought was all from research I did when I had a dream to run cats as well, and from what I read a single cat after an ORY will never get warm enough to properly scrub the exhaust gas.
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This is a different problem.