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18/09/2008 02:25. Jaguar will use the Detroit auto show in January 2009 to launch two high-performance flagships: the XFR and a revamped XKR. Both will come with a new 510-hp, 500-lb-ft, supercharged V-8. To get there, the engine has gained direct gasoline injection and a capacity hike to from 4.2L to 5.0L.

The new engine is a substantial performance gain over Jaguar's current 420-hp unit, surpassing present Mercedes sedans and SLs with the (less powerful) 63 AMG engine mainly because they weigh considerably less. Expect 0-62-mph times for the R-massaged Jags down in the mid-four-second range. Both cars are set go on sale in March 2009.

In design terms, the XFR will have the more noticeable changes. For both cars, the principal sheetmetal change is a set of large vents in the hoods to keep engine and... // MotorTrend Magazine