Thought I would let you guys know that the Saito 170R3 fits perfectly in the cowl. I'm using a Electro Dynamics on board glow igniter and it looks awsome on the ground and in the air. The 170R3 provides plenty of power and required ZERO lead to balance the airplane! The sound is........WOW! I'm using a collector ring exhaust from Keleo. I did have a problem with the aileron covering. It was very loose and required lots of heat to shrink tight. Other than that it went together great! I opted for four aileron servos and now wish I hadn't. The wiring to the upper wing is a real pain and distracts from the looks. Oh well...