1: New engines in each models( 5.3L/5.7L/6.3L/6.8L American Speed V8s)
2: Upgraded suspension
3: Upgraded Brakes
4: Different spoilers(More DF on each)
5: Different tyre compound and different sizes
5: Weight Loss
6: Tranny, 5 to 6-Speed Manual
That's all the differences between the 535 to the 720, the higher up you go, the more extreme everything gets, but only if you buy straight from the factory, If you build one completely yourself, the equipment is bound to change to meet your demands on what you want.