Here is a great build Thread we are doing on an electric Yellow P-38 with massive sound system. Also has videos of the benedini system on Corsair and P-40. SonicBoomRC.com is getting ready to launch the new Benedini systems in the US and they are doing it cheap. Less than half the cost of the AeroSoundRC prices.
http://www.rcuniverse.com/forum/m_11512557/anchors_11528987/mpage_1/key_/anchor/tm.htm#11528987