I've had two Electrostreaks, both ARF's. In each, I replaced the motor with a Kyosho Magnetic Meyhem, a car motor. A cheap upgrade and plenty of power for $20. These have been discontinued. I have another in the cellar and will probably go brushless with it. The AXI 2820 mentioned in the previous thread is an outrunner and direct drive. I have a 2820 in an Ultra Stik 25E and have a 12x6 prop on it as recommended by Hobby Lobby. Haven't flown it yet but the battery is a 4400 Polyquest LiPo.