Us LX owners know this one all too well. ESP system, even when supposedly "off" isn't ever really off. Diablo Predator will help, but won't disable the yaw sensor, so you can't fishtail or you'll go into limp mode.

You guys need to do an ESP mod. I have been selling a $50 device for a couple years now that hooks up to the Yaw sensor and ESP button and, upon pressing the ESP button for 5 seconds, disables the Yaw sensor. This allows you to do donuts, drifts, etc without the computer intervening. BLD still works, so you won't pegleg, and ABS still works.

Nobody has tried one on a Challenger yet, so you can't buy one until I know they'll work on one. I'll give one away free to someone with a Challenger that can hook it up (hookup is simple and only takes about 20 minutes) and is willing to take a couple snapshots of the install.

Once it's proven working, then I'll sell to Challenger owners. You can look at my site at www.noesp.com or Google NoESP and you'll see plenty on forum hits from all different LX based forums.

Thanks
Joe