ys 1.20

[S & A North]

HI i'm hopefully going to be able to buy a used ys 1.20 for a couple 1.20 size planes soon.i've seen some 1.20's for sale with stock muffler,no header/pipe.can these engines be used with success using a stock muffler as opposed to header/pipe if the planes are not competition bound?i prefer using a 4st but will have to buy used due to my small budget,thanks in advance.........shel
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