Dean,

thanks for that info. I've always thoroughly enjoyed reading your column in FM!

ST's are engines from my childhood memories and thus I'm quite fond of them. Based on your comments, would you think that an open pipe (e.g., a Macs 1110 or 1120) might be a better muffling solution for the G20's? These engines used to come with open type mufflers but as you mention, they didn't do much for the engines performance.

David.