Well first let me say that I have not dynoed my flowmaster, but the performance is better and the sound is way better than the stock muffle I had before. Does it feel faster? Yes. Is it faster? I sure hope so, but anyway I would use 2 inch piping from catalytic converter back. If you do not have anywhere around you that can do mandrel bends, I have heard of some using 2 and a 1/4 pipe. Then using good crush bends. I do not know of the validity of this though. Hope this helps a little Marcus
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