thanks for the info guys !!
but you know what we really need ? an in-cowl muffler that will increase power a bit over the today's available mufflers, something like the Youngblood MP2/MP5 heli mufflers,,
http://www.heli-world.com/detail.aspx?ID=5679
a 300 or 400 RPM increase would be quite noticeable on my GBY !!
personally I wouldn't mind a long tuned pipe mounted to the side on my GBY, I think it would look cool, but the guys at the field would really give me a lot of grief about it !!
Jim