Stock motors used to be no more than $25. On the other hand, back in that time frame, we did all we could to make our cars lighter/faster. The car didn't even remotely look like the original factory car when we were done mucking around with them. If you turn that around one more time, my son runs his totally unmodified B5M with a blinky 17.5 in the mod class and does just fine. The track we are currently running on doesn't have any ridiculously short run ups or lengthy triples either. It flows and allows for some great side by side racing with a nice quad section that puts the focus on timing and throttle control instead of max traction and horse power.