Has anyone used something like this with a cat less downpipe?

http://www.fabspeed.com/universal-o2...ic-converters/

I know the ones in the link are expensive, but they also have the biggest catalyst that I've seen with these products. There are others on the market, too. Just looking for any experiences with these types of products - the spacers with a catalyst element.

 

They don't work, these systems are too smart for the spacers or sims. You need to have the car tuned for a catless downpipe to keep from having a CEL.

 

Ditto