[cmracing]

You do not need to have one.

You can put one in if you like.

If you have one in there 99% of the time they will force you to put it up even if you are no required to have one because they don't want it flopping around inside the car.

That is the reason I designed mine differently than most. I can mount mine to my swing out bar so it is not lose when I am not dialing in the 9's and not required to use it, but still don't need to remove it from the car.