A friend no longer in the hobby passed on a MVVS engine 6.5 Black head engine to me. It has a regular type muffler as well as a tuned silencer #3248n. Looking at the MVVS website it looks like a .40 size. What nitro setup should I use in it? Prop? Should I go with the tuned pipe? I'm looking to put it on a 40 size stick plane to use for sport flying. Thanks.