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Faster Cat: Arden tunes the Jaguar XKR 75

Jaguar celebrated its 75th anniversary with a number of special models, including the fleet-footed XKR 75. And a British tuner is goosing this lithe coupe even more. Arden boosts output to 580 hp and 531 lb-ft of twist, while bolting on a high-performance exhaust system and sport catalysts.

Mercedes McLaren SLR Stirling Moss Image Gallery

Mercedes McLaren SLR Sterling Moss Photo Image Gallery [ad#ad-1] The McLaren SLR has been with us a few years now, and has had a few models – roadster and coupe versions of the standard SLR and the 722 – but this is the final model, and what a farewell! Based on the underpinnings of the SLR 722 Roadster, the Stirling Moss is completely rebodied to pay homage to the 1950s SLRs Stirling Moss raced in events like the Mille Miglia.

Tuner MTM debuts 722 hp Audi RS6 Avant

It seems a minor horsepower war has just erupted over in Germany, and the title at stake in this conflict is which tuning house can build the most powerful Audi RS6 Avant. Not that long ago ABT Sportsline unveiled a 700 hp Audi RS6 Avant, an absolutely rabid grocery-getter that can make the sprint to 60 in just 3.4 seconds. ABT's RS6 Avant packs 25 percent more power than the stock version of the RS6 Avant, which made an already hair-raising 560 hp.