N10 Dual Cat Question > > > - Third Generation F-Body Message Boards

92GTA · 04-11-2002, 12:40 AM

For all intents and purposes, wouldn't a top of the line 3 inch high flow cat fee up as much power as the factory dual cats did???

I'm just thinking outloud how for a second there a few months ago I was thinking about converting my car to dual cats but I figured a 3 inch high flow would flow as much as 2 factory cats would....

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johnsjj2 · 04-12-2002, 04:55 PM

I would think you are right. The facory cats on mine were, I think, 2.25". A single 3" aftermarket would almost have to flow better, just by the less resistance on the walls of the pipe.

92GTA · 04-12-2002, 05:01 PM

Exactly, that and the fact that the new one is high flow and not the restrictive factory cat.....

91L98Z28 · 04-12-2002, 07:20 PM

I called random tech a few days ago. They told me that a good 3" flows around 500cfm, and that a good 2.25" flows around 300cfm. So I gues a pair of stock-sized 2.25" would flow around 600cfm....

For whatever it's worth.....