Hey everyone thanks for reading. I was wondering what everyone thought about Hi-Flow Catalytic Converters. I am going to get a new muffler and tail-pipe, the old rusted out, and so I was planning on getting flowmaster. I have had them before and I like everything about them. I was considering getting a new cat, have to have one for emmissions, but I did not know if anyone had experience with the "high performance" catalytic converters. I am really interested in gas mileage, but who doesn't like horsepower right? I have heard that hi-flow cats are not worth the time or money because a cat is a cat is a cat. Anyone have any ideas? If you think they are worth it please state a good brand/model. Thanks.