One issue people have had with their Mini-Z MA-010 AWD cars is that the stock motor gets very hot (I personally think this also contributes to the "lazy pinion" issue where the pinion connected to the motor will just fall off mid-race).  The motors on MR-01s and MR-02s don't seem to have this issue probably due to the fact they are general more open and get more air-flow to disipate the heat faster.  The motor in the AWD is enclosed on all but 1 side.

Well after I got my Mini-Z AWD I wanted to make sure to get something to resolve the hot motor issue.  In addition to the "lazy pinion" issue, too much heat is bad for your motor's performance and longevity. 

Fortunately, the Shop (shop.tinyrc.com) got a shipment of PN Racing parts and included in this shipment was PN Racing's "Mini-Z AWD Alm. Motor Cover with Heatsink" (Part # MA0111).  I picked a blue one and slapped it on my AWD for testing.  Even before buying the part I knew it was the motor cover w/ heatsink I wanted for several reasons: 1) it's metal 2) has a large heat sink area and 3) had "fins" that pressed up against the motor.  All of these things would help with the heat disipation.

Taking the stock plastic motor cover off and installing the PN Motor Cover w/ Heatsink was fairly straightforward.  I was glas to see the fit was very good and looked really nice on the AWD chassis..

Disclaimer: I don't recommend you do this as you could burn yourself but after testing my AWD for about 10 minutes I picked up my AWD, took the body off and touched the large heatsink on the side.  It was definately warm but not scorching hot.  Comparing it to my friends AWD who was running about the same time, his motor with stock platic motor cover was very hot.  I was very pleased with the PN Racings Motor Cover w/ Heatsink heat disipation.

A couple things to note are with the bigger heatsink on the side of your AWD you do have to be more careful handling your car after running it for any period of time. I normally pick it up in one hand from both sides of the chassis and this can result in a burn or "surprise! that's hot!" situation were you accidently drop the chassis.  Additionally it seems to cost more than other AWD Allow Motor Covers w/ Heatsinks.  Another thing is that it is harder to remove than the standard plastic motor cover.  And when removing it be careful not to break any part of the plastic chassis if you are having a hard time getting it off.

But even with these minor concerns I still highly recommend it.

-hobbycar

Links to the part in the Shop.Tinyrc.com:
PN Mini-Z MA-010 Alloy Motor Heatsink Cover -Blue
PN Mini-Z MA-010 Alloy Motor Heatsink Cover - Orange
PN Mini-Z MA-010 Alloy Motor Heatsink Cover - Silver