You have to go for nitro, i tried to install the EP motor and it was absurd. The integrated cowling is too narrow, there is no space to work with. I will need to buy a nitro engine now, not done that for the longest of time! Question is 2C or 4C ... 2C is cheap and the exhaust can be easily diverted away, 4C sounds nice though but will surely get exhaust all over the plane.