The Jaguar XK series (XK8 and XKR) is a grand tourer produced by British carmaker Jaguar since 1996. The car was introduced in Geneva Motor Show on March 5th 1996. It is the replacement of the XJS, and is available as a coupé and convertible. Currently in its second generation, the XK8 was the first 8 cylinder vehicle produced by Jaguar, when the Jaguar AJ-V8 engine was introduced.

The 1997 XK8 (project code X100) was available in coupé or convertible body styles and with either a supercharged 370hp (276kW) or naturally aspirated 290hp (216kW) engine. The supercharged variant is known as the XKR. The first-generation XK series shares its platform with the Aston Martin DB7. Both cars are derived from the Jaguar XJS, though the platform has been extensively changed, with co-efficient drags of 0.35 and 0.36 for the XK8 coupe and XK8 convertible respectively.

Power and performance

Both the XK8 and XKR are electronically limited to a maximum of 155mph (250km/h), lower than the top speed of its predecessor. The XK8 heralded a change in direction for the company, resulting in the S-Type and X-Type.[citation needed]

Both the XK8 and XKR come standard with 18-inch alloy wheels, and 19 and 20-inch wheels are available for additional cost. A navigation system and self-leveling xenon headlamps come standard with the XKR and as options for the XK8. Jaguar's Adaptive Cruise Control is an optional feature available on both models. Both come with all-leather interior, burl walnut trim, and side airbags. Jeremy Clarkson, during a Top Gear (a UK motoring magazine/TV show) test-drive, likened the interior of the original XK8 to sitting inside Blenheim Palace. In 2005 the grille design of the XKR was refreshed.

Limited Editions

XKR Silverstone

Only 600 Silverstones were made, in celebration of Jaguar's return to F1 racing in 2001. It featured a Platinum paint finish, high-performance package (with the same engine as the standard XKR, but improved transmission, suspension and brakes), 20" Silver BBS "Detroit" wheels and a custom interior.

XKR 100

Built to celebrate the centenary of Jaguar's founder, 500 'XKR 100' coupés and 500 convertibles were made in 2002. The XKR 100 featured an Anthracite paint finish, Recaro seats, 20-inch BBS alloys, Brembo brakes, and custom interior. This model may be referred to as the XKR-R as well.

XKR Portfolio

The convertible-only Portfolios were produced in 2004 exclusively for the US market. Of the Portfolio models, 100 featured unique Red paint with matching Recaro sports seats and interior, whilst the remaining 100 had Blue paintwork and interiors.

There is also a 2008 Portfolio model planned which will be available worldwide, featuring the most powerful brakes featured on any production-line Jaguar.[citation needed]

XKR 4.2-S

In Europe the 4.2-S was unveiled at Geneva on March 1, 2005. This was the last XK to be rolled out that was based upon the original 1996 design. Features for the 4.2-S Four 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 19" Atlas wheels plus cross-drilled Brembo brake discs, red wheel badges and red brake calipers were also fitted.