Decat to sports cat?

[yes i'm mad]

Simple question: Would there be a major difference in power over a 200 or 100 cell cat over a decat on a turbo or supercharged engine?

[anonymous-user]

In terms of back pressure, given a suitable substrate cross sectional area, no, Practically nothing for the 100cpsi and only a few kPa probably for the 200cpsi.

The big difference is that without ANY active conversion material, ie a de-cat or "washcoat" only substrate, you don't have to overfuel the engine to limit peak catalyst temperatures caused by the exothermic reaction. However, for a metal foil low density substrate, the component protection overfuelling should be pretty minimal anyway.