The ET works fine for 4 pole motors, with 32p gearing. I have ran that Pro 4 motor w/ a Tekin RSX ESC, since they came out. Works great. I can't imagine needing more power. Also, the bigger tire footprint of the truggy vs the buggy makes it ideal for the bigger motor, in my opinion. My EB410.2 is a 2-pole 13.5 spec car. Both run on 2s. Keep in mind, these are racing platforms and aren't the best option for bashing (although it can be done). And another thing to keep in mind is there is not a lot of space for electronics on these machine. With my 4-pole motor and RSX, there isn't a lot of room for electronics. So if you were to try to fit an even bigger ESC in there (like a RX8 or somthing) it gets REALLY TIGHT.