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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