The .45 and .46NT both had problems when starting. It took a long time before fuel would be burned off and I could slowly advance the throttle to WOT. The engines still had a lot of power compared to a couple of others. The Tower plug made a huge difference. First, I can now crank and not worry about advancing to WOT right away. It has nice, full power right away. Also, the .46NT had a whole lot more power in the air. It is very noticable and the engine really runs smoother. I can't hover, but I sometimes try to hold a Somethin Extra and maybe try a tail slide. With the OS 8 I would guess that I was using 3/4 throttle for this. With the Tower plug I am just under half throttle for the same things.