Tips for first dyno day?

I'm going to this dyno day in early Feb. Classes of cars entering are Fwd and rwd no awd. There won't be many Fwd cars there so I'm entering the hp per liter category
Anything I should do to be prepared? Should I buy a pod filter just for the day or just a stock airbox? What do you guys do?
Anything I should do to be prepared? Should I buy a pod filter just for the day or just a stock airbox? What do you guys do?