Yeah, thanks RCP, and it's a good thought, I agree with you there, on my first ZT2 truck, I had the opportunity to try a couple of modified motors. One was an LRP fusion torque motor, but it got sizzling hot, and another was an Insane 370 which was a bit too old and battered, from a friend on RCgroups.
I think the 400 motor in this example, was not a high RPM motor like say the Speed 400, it seemed to be very limited.
Ultimately I should get a modified motor as you say but it's just whether to spruce up this truck and whether it is worth it. As good as it is, I'm tempted to just bash it with the 3cell. Lol