Guys - I did some research and have found a good pair of cats on ebay for real cheap. My question is, are the cats there for the purpose of just protecting emissions, or are the cats there for the purpose of your engine not blowing up lol...exaggerating, of course... These cats are about 7 - 8 years old and are the universal cheap ones, and I want to make sure that I don't have to buy some MagnaFlow super fine cat for this to work.