one exhaust) and was also available. There was no turbo version of the new Rex. A two-speed automatic transmission was also available, as was a part-time 4WD system. "Twin Viscous" full-time 4WD with a limited slip differential for the rear axle was made available in February 1987. From this point on, all four-wheel drives received the more powerful three-valve engine. A CVT transmission was added June 1987, called ECVT. A supercharged version with an intercooler and electronic fuel injection was added to the options list March 1988 as a response to the success of the Alto Works and Mira TR-XX. The output of the engine increased to . A supercharger meant less lag than for a turbo, although specific output tended to be somewhat lower than the competition. This was available for both the 3- and 5-door versions. May 1988 saw an available electrically deployed canvas top added to the three-door. June 1989 saw a gentle facelift and the replacement of the EK series engine to the four-cylinder EN05 "Clover 4" with available to the standard engine and from the supercharged engine. This was the first Kei four-cylinder since the Mazda Carol, and was unique to the class. Naturally aspirated models received "cat's eye"-shaped headlamps and a reshaped bonnet while the supercharged models retained the earlier rectangular units, albeit with a new four-hole grille. This, the KH1/2 series Rex (KP1/2 for the commercial Rex Combis), remained available in combination with the ECVT transmission and four-wheel-drive versions, but the two-speed automatic was dropped. In July, export versions (M70 in Europe, Sherpa in Australia) received the same changes and switched from the 665 cc two-cylinder to become the M80 in Europe, the Ace in New Zealand and the Fiori in Australia. The 550 cc four-cylinder iteration was uncommonly short-lived, as in March 1990 another facelift followed, with a 660 cc version of the EN engine (EN07) and an extended, more rounded nose because of new Kei regulations taking effect. These external differences did not appear in the Australian market until August, and in Europe (Mini Jumbo, M80) by early 1991. This, which was to be the last Rex, received chassis codes KH3 (FF sedan), KH4 (4WD sedan), KP3 (FF commercial), and KP4 (4WD commercial). Rex is also a common nickname for the high-performance Subaru Impreza WRX, especially in Australia where the actual Rex was originally marketed as the Sherpa and then as