I have been running a 5.5t brushless in mine. The car has a slipper clutch and still has the plastic outdrives. At the moment they are still fine. I do have a spare front outdrive (the tamiya front ones are metal) which I will use if and when the plastic one gives up.
I like the df03 for ragging around, the shorter wheelbase makes it good for bashing as its keen on throwing the end out.
Other hop-ups that are good are
CVJ's at the front
carbon front suspension brace
Rear aluminium suspension brace
centre one way is also good for more steering, cheap as well (£8)
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