My setup:

YS 140 Sport FZ
20% CoolPower
Hatori pipe
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16x11 APC prop @8400 rpm
weight : 10 lbs 2 ozs

Plenty of Power. I am no great pilot,not even close, I like to play alot more than practice, I did some power hungry manuvers like HUGE Hourglasses , Rolling vertical manuvers of different sorts, etc, and was never at a lack of getty-up-go.

I also had the OS 140 on it with a power robbing muffler, and it was just as good, but lacked the slowing down ability of the 4S YS. The downlines carried to much speed no matter what I did to prevent it, including trying a 4 blade prop.