best exhaust for 172 AC?

hi guys

just put a skipper ac engine in my zip, currently has malossi 172, malossi crank, malossi variator, stage6 inlet, vforce reed block and oko 24mm carb, running at just under 20hp

just wondering what exhaust you would recommend? Im leaning towards malossi mhr but alot of people including shiny said pm59 is better and apparently gives 3hp increase? Anyone on here used both?

thanks

 

If i had a choice it would be a pm59...been told da scorpio 1s are hard wearing but dnt quote me on that...nice bike btw

 

love the bike malossi one would look better on a zip as it would look like a 70cc which would leave all peds behind )) but yh with this set up you should go for 59 mate