Another day, another Fiat 500 variant that we Americans can drool over knowing we can't get it here in the States. This one is special, though, as it was designed to commemorate Karl Abarth's 100th (born on November 15, 1908) birthday. Not just a styling exercise, the 500 Abarth "DA O A 100" tribute comes with an upgraded 1.4-liter turbocharged four-cylinder engine. Acceleration to sixty takes just 7.3 seconds, helped along by shortened gear ratios while its top speed is now 131 miles per hour. Suspension bits are revised as well, with lowered springs and new 17-inch alloys fitted with low-profile Pirelli PZero Neros.

Click above for high-res gallery of the Fiat 500 Abarth Assetto Corse

With the revival of the Abarth tuning division, Fiat is serious about motorsports. They've been racking up victories in the Intercontinental Rally Championship with the Punto, and have even been sponsoring Valentino Rossi's MotoGP Yamaha. And to drive the point home, while the "esseesse" (read: SS) version of the Cinquecento Abarth was the division's new reveal, it was this racing version, called the Assetto Corse, that took center stage.

Fiat is set to debut the high performance version of its fashionable 500 -- possibly in October at the Paris Motor Show -- and spy shots have revealed that development is well underway. If fans of the retro-mobile were let down by the Abarth model's relatively puny 133-horsepower and sub-eight-second run to 60, the SS model will improve those numbers considerably. For its range-topping city car, Fiat is likely to fit a revised turbocharged engine offering an estimated 160 horses along with the Q2 Torsen C limited slip differential from Alfa Romeo.

Click for hi-res gallery of Fiat 500 Abarth Opening Edition

At its unveiling at this past March's Geneva show, it was immediately apparent that Abarth had carried off a transformation of the Fiat 500 from a demure retro-hatch into a veritable pocket rocket. But for those for whom the 135 hp turbo four is just not enough, the performance division has unveiled a new limited edition "500 Abarth Opening Edition".

In speaking with a representative at Abath's show stand in Geneva, Autoblog received confirmation that the Fiat performance division its planning its own offering unique from any existing Fiat models. British weekly Autocar is now reporting that Abarth is preparing two new variants, a coupe and a two-seat roadster, but before that will come out with a convertible version of the 500 Abarth.

click above for more high-res images of the Fiat 500 Abarth

If you get e-newsletters from Fiat, you'll have noticed an ambiguous email in your inbox this Saturday. The email contained an advisory to mark the dates February 18 and 19 on your calendar, next to the Abarth logo for Fiat's performance division. Given that the email was the 500 newsletter, that can only mean one thing: the Fiat 500 Abarth is coming to Geneva.