I just made a nice discovery. The Nakamichi Racer controller works with the ZipZaps. IMHO, the NR controller feels SOOOO much better than the ZZ controller. So, for $14, you get a SUPER-FAST car and controller and the controller will control a ZZ on the same frequency. I tried this with a 27Mhz, but the 49 should work too.
Brian
BTW - for those that don't know, the Nakamichi Racers can be found at Wal-Mart or Qvc.com. They are $13.67 at Wal-Mart. Here are some pics of mine:
http://www.thebrokenjoystick.com/pictures/nakamichi