I had an ECX Boost for a while. Out of the box, using NiMh batteries it twisted the driveshaft ends so they kept popping out & then the diff threw a wobbly too.
I did install the upgrade metal geared diff & had to replace the driveshafts with modded Traxxas HD items, I then ran it without problems using 5000mah 30c lipos & a 15t HPI Firebolt motor.
I have to say I wasn't completely satisfied with it (self tap screws kept coming undone etc) but the above upgrades generally made it reliable.
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TLR 22 3.0/3300kv brushless Lunchbox/Helion 2wd sct/Dromida MT4.18/Orlandoo F-150/Mardave Cobra/Re-re Cat xls w/uprated tranny/Re-re Top Force/Carisma GT24R
http://www.norfolkbuggyclub.moonfruit.com/
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