Starting with the regular 3.6-litre engine, Porsche fitted a pair of KKK K16 turbochargers and Bosch M5.2 engine management. Output jumped to 408bhp at 5750rpm. Compression was dropped to 8.0:1 and the reinforced six-speed gearbox fitted with taller ratios. Performance was explosive with a top speed of 184mph and 0-60 in just 4.5 seconds. Like all turbocharged 911's, this latest variant received heavily flared wheelarches and a static rear spoiler. Unique to these cars, the body-coloured rear wings were fixed in place and housed the turbocharger intercoolers. At the front, a new valance housed a prominent central duct flanked either side by supplementary vents. The wheelarches were squared-off at the base to merge with the deep side sills and gave an even more purposeful stance. As normal, the Turbo's interior was for all intents and purposes unchanged, just a few minor switchgear alterations having been made. For the 1997 model year, Porsche produced the most exclusive road going 993 of all and what became the last air-cooled 911 Turbo - the Turbo S. Based on the standard Turbo, the Turbo S (pictured below) was enhanced with a number of special features.