Click to view the Adren AJ21 in high resolution

With the M5-battling Jaguar XFR looming high on the horizon, German tuning house Arden's release of its new AJ21 comes at the perfect time. The XF-based performance sedan, details of which have been trickling out for several months now, offers a range of modifications to give the sharp cat that extra edge.

As you can see from these new images, Arden's given the Jag's appearance a serious makeover, much to the benefit of its aerodynamics. The front end has been thoroughly redesigned to include a bigger grille and vents to help the engine get the air it needs, while the front spoiler keeps things planted. Around back the diffuser and discreet spoiler keeps the tail nailed as well, with side skirts helping along the way and integrated vents to help cool the rear brakes. The package also includes a revised suspension and 21-inch forged alloys, but the real treat is underhood where Arden has worked its magic on the entire range of engines available on the XF. The range-topping supercharged V8 has been bored out from 4.2 liters to 4.5 and is aided in producing 500 horsepower by a custom crankshaft, con rods and pistons. The same enlargement can be done to the naturally-aspirated V8 for 380 hp, with the 2.7-liter diesel six tuned to 250 hp instead of the stock 207. Customers can also specify custom interior options, but to our taste, we'd leave the leaper off the hood. Check out the pair of new images in the gallery below.

Gallery: Arden Jaguar XF AJ 21

Update: Arden releases details and pics of AJ21 originally appeared on Autoblog on Thu, 14 Aug 2008 13:57:00 EST. Please see our terms for use of feeds.