I'd say the essential upgrades would be...
1. Ball Diff. At least one in the rear, as if / when you land on throttle, the gear diff will give up.
2. Steel Driveshafts all round. The FTX ones are best, and these come with steel outdrives for the geared diff too. If you keep the kit diff in the front, make sure these are fitted.
3. new shocks. Either Mini-T 3 Racing ones, or FTX Pro Alloy bodies shocks. If you use the FTX shocks, a lot of people use the kit silver shock shafts, and not the hardened gold ones that come in the kit. (The hardened ones are brittle).
4. FTX Alloy front knuckes or FTX Pillow Ball Coversion kit. I wouldn't bother with any other alloy knuckles, such as 3 racing or GPM. The FTX ones are best.
However, the PBS conversion is pretty strong, and very popular at the moment. Its only £16 for a conversion kit. FTX alloy knuckles are about £25.
If you are on a budget, I've got a set of 2nd hand FTX alloy knuckes for sale.
5. foam tyres, assuming you are running indoors?. The kit tyres offer good grip, but will only last about 5 rounds if you are lucky. Gecko foams are popular at the moment. I run them. They are cheap too.
6. Motor - FTX Pro 32000 rpm motor is pretty popular. The kit motor can be competitive though, especially if you advance the timing.
14g is a bit thick for wiring, but its alright, it makes the cell pack a little bit too tight in the battery tray. 16g wires would be better. Lighter too! Deans are the most popular connectors by far.
Hope this helps.
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