First off the in an SRT6 and the traction control off (by the switch) you can get the car sideways, BUT, it should start to cut your engine power significantly as it can sense (through the Yaw sensor) that you are in trouble (or so it believes). Sideways = trouble for the average driver.

If your engine is NOT cutting out or reducing power to let you catch and get traction, then I'd get the Yaw sensor checked ASAP!!!

Now, if you want fun... you can disconnect the Yaw sensor on purpose and turn off the TC and you can doughnut to your heart's content.

Hope that helps.