I have been running a Sidewinder 4600 combo on 3s and its more than enough power infact its too much.But overpowering a model leads to lower running temps but also can shredd a drivetrain.I highly suggest a center Diff to even out the power.
SC8-E RCM MMM CC 1717
Slash 4x4 MMP CC SC 2400
SC RC8BE MMP Neu Tekno 1512/2D
Mugen MBX6 Eco MMP Neu Tekno 1515/1.5D