I measured my setup and determined that an extension should give me the clearance that I need. I just ordered one from tower. You were right that the mufflers were interchangable. Thanks for the tip. Another question...when you say you're flying it in, I gather you mean that you come close to 3 pointing it. Not much flare at all I gather. I just bought 3 wooden props...I suspect I'll need to get some APC pushers.