they have what is known as a 'sports diff' in the 1.6 8v and 16v's from the VTR/S, these are meant to cope with putting down that huge saxo POWWAAHH better.. the others are like cheese with really weak diffs.. with my old cammed VTR I literally blew the diff up and it ripped through the casing.. that was a 1.4 box. It soon shredded a 1.1 box after lol.