that actually still works, but it's specific cars that cause it to work...
http://www.se7ensins.com/forums/threads/new-get-colored-bmxs.1391539/page-8#post-12475988
z-type works for bmx's
stinger for the scorcher
adder for the cruiser
First few I've taken since Christmas!
Don't normally bother with bikes but wisely invested in an Akuma. First race I used it in (stunt race) I actually won!