I want to put emmissions back on my car. Im getting tired of the stink, and I have inspections coming back up again. I have a 3" 'high' performance catco one that I use for emmissions, but its a standard size cat, and its way too restrictive for daily use. Were talking like 8-10 PSIG of backpressure from this thing at WOT (no, its not melted down...)

I remember way back when seeing a HUGE cat used on Truck TV or something for a 350 S-10 swap. How come they dont make them like that? All the ones available are all too damn small. Id have to run at least two, maybe three of them not to gag my engine. Is there a single cat that can handle 375-400HP? Or do I have to get creative?

 

I've been looking for this myself. I cannot find any flow data anywhere on aftermarket cats. Random Technologies and Magnaflow spun converters both look good, but I don't know how well they actually flow. I think I'm going to wind up getting the RT cat though. Might check them out.