This is a quick plug for the A1 Grand Prix, which offers close and exciting racing. The cars are all of identical specifications, and painted in the colours of their countries (each country in the series gets one car). The format is easy to understand, and the combination of identical cars and the power boost button (which provides a temporary power increase for overtaking) results in the close and exciting racing I advertised in the opening sentence. Plus, provided you’re in/from a country represented in A1, it’s not hard to find someone to support.
I recommend giving it a look even for those who don’t watch much motorsport.