Whenever I think of NASCAR, I always think about late 90's - early 2000's nu metal. I feel like most of this influence was both due to EA's soundtracks in their games and the general state of rock during NASCAR's peak.
For me, Click Click Boom (2001) by Saliva is probably the most NASCAR-y song for me. It just instantly takes me back to the sport's most successful era and captured the pure raw energy of stock car racing back then. I can picture the wavy Gen-4 spoilers, the eye candy paints, the crowds of people around haulers, tailgating around campers, not having a worry in the world and enjoying NASCAR at it's best.