9L in rustler

[RC-Monster Mike]

If you have found the performance that makes you happy, stick with it. The 8s is a faster motor, with less torque. With the proper gearing, the 8s can be faster on the low cell counts(well, quicker at least). The 8s also weighs quite a bit less than the 9L, and won't hang out in harms way off the tranny.