If you’re looking to start out in motor racing and you’ve got the cash, there’s a number of exotic automakers that offer their own spec racing series. Ferrari
has its Challenge series, Lamborghini
the Super Trofeo, Porsche
various Carrera Cups and Maserati
runs its own Trofeo as well. Each of these championships runs identical machinery derived from their respective road-going sportscars, but upgraded to competition specifications.