What you want to achieve if performance then that would not happen instead you might feel powerloss...
this head belongs to a 125cc/150cc Chinese cruisers which came in early 2000~ and they had a really really poor quality by that time and they died even before completing first 5 years... this head I suppose been pulled from some same dead engine and has already expired...
If only show shaw" is the matter which you want to achieve with two mufflers then its a good to go...