Shoppers considering Jaguar's luxurious XJ sedan will soon have two sporty new performance packages to choose from. The automaker recently announced the availability of the optional "Speed Pack" and "Sport & Speed Pack," which improve the sedan's performance and offer subtle upgrades to its exterior and interior.

According to Jaguar, the Speed Pack is only available on the high-performance XJ and XJL Supersport models, which feature a 510-horsepower supercharged 5.0-liter V8. While the performance package doesn't offer any drastic changes under the Supersport's hood, it does remove the sedan's 155 mph speed limiter, setting a new top speed at a wild 174 miles per hour.

But the biggest upgrades from the Speed Pack come to the XJ's exterior. In front, a splitter is added to help improve the sedan's aerodynamics, while a spoiler is added in back to add to its sporty look. Other exterior upgrades include gloss black accents, red-painted brake calipers, and a choice of unique 20-inch "Venom" or "Matavia" wheels. The Speed Pack also upgrades the sedan's interior with a unique Jet Black color scheme featuring red contrast stitching.

XJ and XJL Supercharged models, which feature a 470-horsepower version of the same supercharged V8, gain the optional Speed & Sport Pack instead. While exterior upgrades and an increased top speed are shared between the two performance packages, the Speed & Sport Pack adds a suede headliner, a bright metal pedal kit and sporty 18-way power front seats with active side bolsters and ventilation - all standard on the XJ Supersport - plus unique black and white interior coloring.  

"The XJ is much more than a limousine," said Ian Callum, Jaguar's design director. "Its power and potential mean it can out-perform many so-called sports cars. The new Sport and Speed Packs allow customers to enhance that sporting dynamism even further and create an XJ that looks as good as it drives."

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Jeffrey Archer is fortunate to have turned a passion for cars into a career. His wide-ranging automotive experience includes work for automakers and dealers in addition to covering the news. When not writing, he spends his time searching for unique cars on AutoTrader.com.

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