based upon the original 1996 design. Features for the 4.2-S included new exterior and interior colours and two distinct veneer options for the instrument panel, polished door treadplates with chequered-flag emblems and embossed, leather-edged floor mats. The revised white Jaguar badge on the bonnet also feature chequered accents. New unique 20-inch split rim BBS Perseus performance wheels plus cross-drilled Brembo brake discs, red wheel badges and red brake callipers were also fitted. The S gains firmer springs, dampers and anti-roll bars, steering is 10% quicker and the ride height has been lowered by 10mm. The electronic speed limiter was removed to enable the car to reach a top speed of . Production was limited to only 200 cars in four new exclusive exterior colours – Copper Black Metallic, Frost Blue Metallic, Bay Blue Metallic and Satin Silver Metallic. XKR-R concept A concept car called the XKR-R which was very similar to the production XKR was produced in 2001 as a test bed for future Jaguar models. It boasted a more powerful engine, a limited-slip differential, a 6-speed manual transmission and improved handling along with visual differences from a standard XKR which include a larger rear spoiler, a quad-pipe exhaust system, a fully functional front grille and larger five spoke alloy wheels. Two cars were made, an open top show car to be shown to the public and a functional test car having a coupé bodystyle. The test car featured a similar carbon fibre trim interior as the show car but had Recaro racing bucket seats with six point harness. Motoring journalist Tiff Needel tested the XKR-R test car in 2001 in an episode of Top Gear. Carbon Fiber Edition The Carbon Fiber Edition was one of Jaguar's most limited editions, with only 100 vehicles initially released in the UK in late 2004. In 2005, 200 Carbon Fiber Edition vehicles were produced for the USA market to commemorate SCCA Trans-Am racing successes (source: Jaguar promotional brochure). These vehicles were manufactured in only one configuration (XK8 convertibles) and were only available in one of four color combinations: Ebony exterior over Charcoal interior; Platinum exterior over Ivory interior; Platinum exterior over Charcoal interior, and; Slate exterior over Dove interior. Due to their very limited production, if a dealer was selected, they were authorized to receive only one for sale. The interiors featured dash, console and door elements made of carbon fiber rather than