that adorned the earlier cars were dropped in favor of matching color parts. Another special edition, the "Shiro Special" (SS), was released in 1988. It was only available in pearl white (Shiro meaning "white" in Japanese). The SS package consisted of analog gauges and climate controls with a black interior, stiffer sway bars, stiffer springs, non-adjustable suspension, special seats (Recaro), a viscous-coupling limited slip differential, and a special front lower lip spoiler. This package had no options; all 88SS cars are identical. The 1989 Models are identical to 1988 models, though somewhat rare because Nissan winding-down production early in preparation for the second generation 300ZX. Fourth generation: Nissan 300ZX (Z32, Second model) The only thing unchanged from the previous generation 300ZX is the 3.0-liter V6 engine, now with dual overhead camshafts (DOHC), variable valve timing (VVT) and producing a rated and naturally aspirated. The turbo variant was upgraded with twin Garrett turbochargers and dual intercoolers. This produced with of torque. 0-60 times of 5.0-6.0 seconds were reported, and it had a governed top speed of . Upon its release, the 300ZX won Motor Trends "Import Car of the Year" in 1990 as well as "One of the Top Ten Performance Cars". Automobile Magazine honored the 300ZX/300ZX Turbo as its "Design of the Year" and added it to their "All Stars" list. Road & Track named the 300ZX Turbo "One of the Ten Best Cars in the World", and Car and Driver added it to their 10Best for the seven years in which it was in production in America. American Z-car sales reached 1 million in 1990. Nissan utilized the Cray-II supercomputer to completely design the new 300ZX with the form of CAD software. This made the 300ZX one of the first production cars to be developed in a CAD program. In return, it featured a whole host of technological advancements. On the twin turbo models, four-wheel steering was available under the name Super HICAS (High Capacity Actively Controlled Steering). The twin turbochargers, intercoolers, and requisite plumbing were left for a cramped engine bay; however, everything fit perfectly. Like previous generations, Nissan offered a 2+2 model with the Z32. In 1993, a convertible version was introduced in the Z-car's history, as a response to aftermarket conversions. All 300ZXs now featured T-tops as standard, yet there were some rare hardtops (known as "slick tops") produced as well. The 300ZX was doomed to