Strato, sure thing. I get the JP480 motors from http://www.rctankelectronics.com/ but I don't see them listed, send the owner Ian a message I'm sure he can get you whatever information you may need. All I know is they fit inside the tank although just barely and they really make a lot of torque! Especially with 15 amps of power being sent to them.

As for the speakers the reason it runs 4 are I use these Mato speakers http://www.matomart.com/prodview.php?p=2926 and uses the IBU2 electronics found at the first link I gave you and the amp board. The IBU2 amp board splits the engine and track sounds from the main cannon and machine gun sound. The the engine sounds get a set of speakers as do the main cannon, so 4 speakers. 2 attached under the rear engine deck with 3M double sided tape firing upward thru the radiator grills. 2 located up inside the turret 1 under the commander and 1 under the gunners hatch. Their are many small holes or if I want I can open the gunners hatch and the 1 speaker is right there so plenty of gun sound come through.