well for number 5......... they mentioned start your engines which could be a refrence to race cars or racing and then 4.3 if you take out the . you have 43..... a number directly associate with Richard Petty Driving school....... once again racing.
i know for a fact they do Richard Petty driving school at Texas Motorspeedway....also 43 is the same # of cars that start a Nascar Sprint Cup Race.