I fitted a Spektrum Voltage Protector into my Futaba receiver.
It's just an electrolytic 10v 4700uf cap.
The problem with BEC's on some of the ESC's is that the voltage is slightly lower (5.8v) than the rated voltage of the current crop of servo's, so if the servo requires that little extra it can cause the voltage to the receiver circuit to drop.
Although it may help with glitching the main reason for adding these among the people that I know is to remove the chances of a Personal Transponder missing a lap during one of the voltage 'drops'
The capacitor can fit into any available slot in the receiver.
Luckily I have a 3 channel receiver, so with my personal transponder and the cap all the slots are taken.
Skiddins