RE: Mods please read
There's already a sticky in the engines forum for break-in, tuning and some other decent info for nitro engines. There's one for chassis tuning and gear ratios in the general forum. There's a good 'How to" stickey that covers batteries and such in the electric off road section. And there are some others around too. Why does every fourm need stickies anyway? Just reference to the ones that are already here.