The Jaguar XFR-S has been unveiled at the 2012 LA Auto Show, and we can tell you that it’s a real beast. 
Jaguar’s XF sedan it’s based on the XFR model, but power from the 5.0-litre supercharged V8 has been boosted by 39 bhp to 542 bhp and torque is now a thumping 502lb ft. In order to handle the uprated horsepower and torque numbers, Jaguar has also upgraded the suspension. 
Therefore, suspension knuckles have been swapped out for those from the XKR-S for increased camber and castor stiffness while the 20-inch forged aluminum wheels are wrapped with sticky Pirelli tires. 
Thanks to this upgrades, the XFR-S shaves 0.3 seconds off the XFR’s 0 to 60 mph time (4.4 versus 4.7) and raises the sedan’s top speed to 186 mph from 155. The good news is that the fuel consumption and emissions remain the same, aided by an engine stop-start system.
On the other hand, the designers have also added numerous cosmetic and functional aesthetic changes like the new front bumper with larger air intakes, extended side sills, aero blade moldings, an extended rear bumper with a larger diffuser, and a duo of new trunk spoilers.

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Source: Jaguar