Thanks for the tip with the chart.
I will use the KS 1060, which is fine for engines up to 70cc. The KS bats are commonly used in aerobats, particular in competition over here. They give you some 300-400rpm advantage from the KS canisters at pretty much the same weight and the canisters are usually used anyways to meet noise restrictions. The bats give you an rpm advantage with about any engine, whether DA, ZDZ or 3W, but one of the engines with best response using a tuned pipe is actually the G62 .