yaeh,

I got firebat about 1 month ago. It is really stabile and good plane, but the bundled engine is very close to nothing. I installed Mega 16/15/3 brushless with 10 cell nicad battery (zagi battery with 2 additional cells) and 5x3 3-blade prop and ... oh boy ! that plane was screaming Believe me, it is fast!!!!
It was kind expensive though, ~$200 for the engine+esc only, but well worth it. I propose that you try that
Right now, I installed that engine into Slinger (from great planes) and I just love it. The manufacturer says that with standart engine, it can go up to 65mph and with mega-engine I fly circles around standard one. Just remember to add carbon fiber support to wings ... others you'll need your trash bag

The only problem is that when you fly too fast (in the dive or horizontal flight with full throttle), you will loose the control of the plane as the ailerons won't respond anymore due to the too fast airflow, if yoy allow that term.

My next thing is to put two of the megas into a "http://www.nesail-online.com/detail.php?productID=226" and see how fast it really goes.

I love glow engines, but for park flyint, these toys are nice

just my $0.02