I have a sc10 4x4 with mmp and Novak 5.5 hv 550 motor. I am going to buy a motor very soon. I would like to hear comparisons of the Viper, Tekin and Novak motors. Most guys around here run the Tekin Pro4. I don't know anyone running the vipers, but am very interested after reading about them. I am interested in the 550 and the 540 if Viper has one like the Pro4.

What Viper motor compares to the Tekin Pro4 540?
Will a Viper motor run well with a MMP? If so, which models?
Whats the difference between the viper copperheads and their other motors? I really am interested in the sensored unless someone changes my mind.

Also, I really like the idea of the progauge.....any info would be appreciated.