The R32 Skyline debuted in 1989. It was available as either a 2-door coupe or 4-door hardtop sedan, all other bodystyles were dropped. The R32 featured several versions of the RB-series straight-6 engines, which had improved heads (the twelve port inlet was gone) and used the ECCS (Electronically Concentrated Control System) injection system. Also available was an 1,800 cc 4-cylinder GXi model. Most models had HICAS four-wheel steering, with the rear wheels being hydraulically linked to the front steering. The 2.5-litre GTS-25 became one of the first Japanese production cars to feature a 5-speed automatic transmission. The GTS-t came in standard and Type M configurations, with the Type M having larger five-stud 16-inch wheels, four piston front callipers and twin piston rears plus other minor differences. ABS was optional (except for the GT-R and GTS-4), mechanical LSD was standard on the GTR and viscous LSD was standard on all turbo models and optional on all but the GXi. Nissan also produced 100 Australian models of the R32. In addition, there was a 4WD version of the GTS-t Type M, called the GTS-4.