The most popular upgrades that we have for the Mini Z Monster are the followings:

X-speed Miniz Motor-v #KYA-MZW8P
This motor is a MUST for the Kyosho Mini Z, it is a high revving motor that increases the maximum speed and acceleration. If speed is what you are looking for, then this motor is what you are looking for. This motor will turn the Mini-Z from speedy fast to lightning fast.

Aluminum 5 Spoke Rim #3R/MR02-FN05/LB
Upgrading the aluminum wheel isn’t necessary just for the awesome look of it. When this car is so small, you would need some weight to hold it down if you are going too fast. It also replaces the stock rims that aren’t hard enough to take the stress of the car with speed.

Swing Shaft #3R/AWD-02/H
Swing shaft is pretty much the most important part for the steering system. IT helps to smoothen the steering as well as helping the car to turn sharper. The stock swing shaft is probably one of the fastest part that broke into 2 pieces, upgrading it to aluminum would minimize the breakage.

Aluminum Knuckle #3R/AWD-03
As you all know, the knuckle is like the core part of the hand of the car. This Upgrade is not simply a stronger version of the stock ones, but it also increases the steering and turning angles of the car.

Aluminum Battery Heat Sink Mount
The heat sink mount isn’t something that directly upgrade the car. However, it does indirectly help increase the performance of the Mini Z by reducing the temperature of the car, preventing the damage caused by overheating of the motor.