Touring Car Masters is a support series that runs in conjunction with Australia's V8 Supercars. Basically it's old muscle cars (mostly Mustangs, Camaros, and Falcons) making absurd horsepower (I've heard numbers as high as 700 hp), along with a smattering of old Porsches, all racing on the same tracks as the Supercars use. The cars may be classics but the drivers definitely aren't babying them out there, they want to win. It's great.
As an added bonus the series has been putting most of their races on their youtube channel this year. Screen grab from Sandown Race 1: