German tuner Arden will introduce a performance upgrade program for the Jaguar XKR-S which will take the British coupe to around 645 PS.
This program which increases the output on the car’s supercharged 5.0-litre V8 by around 95 PS should also be responsible for the lowering of its 0 to 60 mph sprint time by around 0.8 seconds which means it will reach 60 in around 4.2 seconds instead of 5 seconds.
As far as visual enhancements, this initial image that was published by Arden of Facebook shows new elements such as new mesh grilles and unique, double spoke design alloys.  

Source: Arden via Facebook