you wont like the 18t as a speed run car they brake a little to easy. the diff will be a problem from the start and if you flip it at high speed you will haven't to watch it closely so you will know where the parts went flying to. i have beefed mine up as much as you can and i still having trouble with it bracken. i went so far as modding in a standard size servo in it to save me from buying mini servo gears.
if you want a speed pass car you will be much happier with a 1/10 on road it will cost you a little more money but will save you time and money after trips to your hobby shop for parts to keep the 18t running. a used tc3 or tc4 on ebay go for under 90.00 all the time
mine not what you want
much happier
