I am considering getting the Magnaflow Direct Fit Catalytic Converters for my GTO. I was wondering if anybody has had any experience with this product. I would appreciate your opinion if you have. If you have used another similar product that input would be appreciated as well. I'm not talking about the off road midpipes with the cat delete. I'm talking about the prefab catted pipes with the single cats and the O2 holes already there. Thanks for you help in advance.