I know in the City Of Indutry, roland heights, diamond bar area there is a shop or 2 down there im thinnking the name is Robo Car, they Used to be there i dunno. There is also Kamikazi racing in Temecula and a couple others

 

I've heard mixed results about RoboCar. Word used to be that you needed to pay cash and give a fake address if you didn't want to donate your go-fast goodies to the midnight auto supply truck. Dunno if it's still the same, but I'd probably think twice before heading over there...

-Josh