sounds a bit tricky yes, but if you go ahead and experiment with that be sure to write about it here on the forums. I think its very interesting stuff. If I`m not satisfied with power after modification on my 50 sizers I will shoehorn in my fx 91 in the 40 size plane and start modding on that one too.Already done the muffler on that 91, but the sleeve is up for a treatment[sm=lol.gif]