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Then the newer design was the honeycomb version that flowed better since it had straight through passages. So today most cats are the honeycomb design, so are all high flow versions. I suppose there are some differences in the really high flow cats, like larger passages, larger cross sectional area of the matrix, larger bore inlets/outlets, etc. Probably makes a little difference.


When I was having the exhaust put on my rig a few years back the exhaust guy told me my cat was shot. I told him to put on a high flow and he told me all cats are high flow now days. Then he explained the exact thing you just posted. I asked him how long it would last and he told me not as long as the OEM but you will smash it up anyway so just go with the cheaper one.

David Fritzsche
1990 Ex-Cab V-6,5-speed, with a few mods
04.5 CTD Dodge 2500 Ram--Tow Rig
Roseville, CA

"Serenity through Sobriety"