Stuntobots
Name Transforms Into… Body Part When Emerging
Off Road Lamborghini Countach Left Leg
Asphalt Kicker Ferrari Right Leg
Turbine Titan Tractor-trailer Body & Head
Spin Out Porsche Right Arm
Road Thrasher Formula-One Race Car Left Arm

They Combine To form SERENASOR

Did the Stuntobots and/or Stunticons do more stunts that any other Transformers bot types you've just made up?

The Stunticons were named that by Rumble & Megatron on the show.