Can i put an .18 in it?If so,what one would be the easiest and what one would be a half way decent one?Now the gearing,it's a 2 speed and what CB and other gears would go good to get the fastest speed out of it?I'm not sure how many teeth are on any of them right now.Thanks.

yep you can put an 18 in it, i have one in mine, if its the RTR EVO version you will need mounts though, here is what i recommend

http://www2.towerhobbies.com/cgi-bin...&I=LXGGP6&P=ML
http://www2.towerhobbies.com/cgi-bin...?&I=LXCLR3&P=7
or the crappy mounts http://www2.towerhobbies.com/cgi-bin...&I=LXN373&P=ML
http://www2.towerhobbies.com/cgi-bin...?&I=LXDHM2&P=7
http://www2.towerhobbies.com/cgi-bin...?&I=LXDHM5&P=7
http://www2.towerhobbies.com/cgi-bin...?&I=LXCLR7&P=7
http://www2.towerhobbies.com/cgi-bin...?&I=LXM617&P=7
and if you dont already have it http://www2.towerhobbies.com/cgi-bin...?&I=LXLST3&P=7
and for the slide carb setup http://www2.towerhobbies.com/cgi-bin...?&I=LXCXF8&P=7 i ahve this same setup in my car and it hauls *****, my OS is highly modded and its insane, i currently have poweredbynitross sending me his os 18 cv-rx to modifiy

I have that same car,- I put an O.S. 18 cv-r on it, and it FLIES!
That is definately what I recommend, ands it's going to be about $120

got my os for $110 off of towerhobbies, and you tihnk the stock os 18cv-r flies.......try modding one

Cool,thanks guys i gota do it