I've driven early 90s ABS cars, and current generation Porsche's and everything in between ABS wise on the track and no way no how would I want a 'typical' IT car ABS system to race with. Those early systems will not let you get the most out of a good setup. The Porsche stuff is another story - just awesome. The Z4 is alright, and would probably be helpful, but nothing ever felt right like the P car.