My cats are clogged, and my choices are to gut them, or replace them right??? Someone said hi-flow cats would be better than gutting them, but i didn't wanna spend a ton of money...there are some for sale on ebay, would u guys take a look and tell me if they are right fo me? :)....they say they have a 2 1/2 inlet and 2 1/2 outlet...i don't know what the hell they're talking about, so could one of u guys help me out here, here's the link: