I put together a GP Pitts using the folowing...

OS 300 Super Gemini Twin
Slimline Pitts muffler
Futaba PCM receiver
Seven Futaba S9151 Digital servos
One Futaba 3003 for throttle
Ram Onboard Glow Driver
EMS Battery Backup system
Charlie Hillard Graphics

This is one of the sweetest flying airplanes that I have ever flown. It does most any manuever at 1/2 throttle and the sound is awsome!!!