on the esc's and motors in stock.. make sure your motor is cleaned and lubed first.. I helped a kid just do his motor who had his car spotless, and the outside of motor spotless but it was just kinda slow.. I took the motor out and cleaned it really good.. lubed the bearings and reset the timing and put it back in.. wow it was like a whole different motor.. and it wasn't even that dirty inside..
most of the newer esc's are pretty good.. I like the lrp stuff.. but orions are great.. hobbywing is great.. novak has some really nice ones too. and a bunch of others as well..