has anyone done any comparisons on the exhaust systems out there because all i read is about hmf and was wondering what the deciding factors were in choosing that exhaust over some of the other manufacturers like Big gun, Supertrapp, etc. any help would be appreciated.

 

I would also like to pipe and jet the grizz, I'm waiting for someone to make a powerful QUIET pipe.

 

I have a White Bros. E series on mine and was told it is the best for putting out the most HP 7 is what I was told? It does make a big difference in torque! Bet make sure you get a new design one with 2 mounts on it ,because the other ones are JUNK and WILL BREAK!