I have used a hobbywing xtreme stock 60a with 7.5t motor running 40 steps of boost at silverstone and never had any issues with them. Have the same setup in all three 2wd cars so a 100a esc will be fine.
Car wise any low rider car will work at silverstone so long as you put a setup on that works for you. As pointed out the kf2 is well proven but can be seen as fragile if your not experienced - X-ray are strong, well built but as they were a new car last year people were still learning the setup. Yokomo Yz2 and the b6 will be strong performers and decent reliability too and setup advice is easy to come by as popular choices.
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