Maclan Racing has a new motor lineup, the MR4 series. These motors are designed for 4WD Short Course racing and come in two kV ratings to suit your track layout. Use the high-torque 3500kV motor for smaller, indoor tracks where quick bursts of speed are desired. Use the 4150kV motor where more RPM is required, usually on larger, open tracks.
Both can purchased through Hobby Authority Distribution.
MCL1019 Maclan Racing MR4 3500kV
MCL1020 Maclan Racing MR4 4150kV
[source: www.hobbyauthority-dist.com/]