The use of fuel injection ,abs,computer management systems,traction control,climate control ,leather seat,reversing cameras,satnav,reverse sensors ,distance front sensors etc are all up there .RTS started in hz's was probably the start of a better handling car for Australian cars, this was a brake from American handling type car and a move to european sport car type and made Australian cars much more enjoyable to drive with a sports car type handling.So i think firmer suspension and better handling.