9ff

If you're looking for the world's fastest car, this very well could be it. It's called the GT9-R, and it's the latest product from Porsche tuners extraordinaire 9ff. Although based loosely on a Porsche 911, little of the end product is shared with the existing sportscar. Instead the GT9-R packs as much as 1120 horsepower in a lightweight custom body for a top speed in excess of 414 km/h (257 mph), making it arguably the fastest car in the world – faster even than the Bugatti Veyron.

Although intended for use on a race track, the GT9-R (like the marginally less extreme GT9 before it) is fully street legal (in Europe, at least), and is available in 750 and 987 horsepower guises as well. Only twenty will be made at an undisclosed price, but considering the "base" GT9 cost half a million euros, make sure you've got enough left over for gas and tires.

A Porsche is special enough for most, but for those looking for a bit more, there is no shortage of German tuners that specialize in Zuffenhausen's finest who'll be glad to bring it to the next level. Arguably foremost among them is 9ff, the relatively new outfit that made its mark with the record-breaking GT9.

With the Essen aftermarket tuner show coming up next weekend, 9ff has prepared the new Speed9. Based on the latest 911 Turbo convertible, the Speed9 sacrifices its rear seats for a slick profile evocative of the iconic 1955 Porsche 356 Speedster, with enough ground effects to match. Naturally 9ff hasn't stopped at looks alone, boosting the twin-turbo engine up from 473 horsepower to a shocking 650. No official word on price or performance, but you can expect both to exceed expectations.

Few countries are as car-crazed as the United Arab Emirates. The oil-rich gulf state has more exotic supercars than you can shake a stick at, and they're about to get three more. Porsche tuner extraordinaire 9ff is planning a limited run of convertible versions of its epically fast GT9-R. The fixed-roof version is capable of rivaling the Bugatti Veyron for speed and acceleration, with a 250 mph top end and a 0-60 run in under three seconds. The company just launched a dedicated website for the Emirates, and on it announced the availability of three convertible GT9-Rs exclusively for that market at an undisclosed price, together with this sketch. Those who say that money can't buy you happiness clearly aren't car fans, then.

The new Panamera may have just debuted, but that won't keep Porsche's strong legion of aftermarket tuners from doing what they do best. Already two of the biggest and most prominent have released tuning packages for the new four-door sedan, and a horsepower war has ensued.

9ff was one of the first to release its plan for the Panamera, before the car was even out. The tuning house behind the Veyron-battling GT9 supercar has a three-stage program for the Panamera Turbo (pictured at right), offering power in 550, 600 and 650 horsepower increments, besting the stock turbo's output of 500.

Gemballa is firing back with a take on the Panamera which it calls the Mistrale, pictured above. The company that made its name tuning the top-of-the-line Carrera GT just released details on its own Panamera upgrades, including a boost in output up to 750 horsepower, plus an air suspension and upgraded brakes. Both the 9ff and Gemballa Panameras offer their own suite of aerodynamic enhancements, interior upgrades and 22" wheels, and are fighting hard for their slice of what is sure to become a big a very big pie.

When we reported last month on the Wimmer RS 911 GT2, we surmised that just about everything else would be left in its wake. We were mistaken. Because while most cars – Porsche's own top-of-the-line GT2 included – may have trouble keeping up, here are a pair of bad boys that clearly won't. Because while the Wimmer GT2 packs an impressive 680 horsepower, each of these custom GT2s produces more than 800.

American tuning house Switzer has replaced the stock Porsche turbochargers with even larger ones, recalibrated the engine management and fitted a custom exhaust system to produce a certified 800 horsepower running on standard 93-octane gasoline. Pump in a higher-rated fuel and there's no telling what the Switzer GT2 will be capable of. But if you're looking for something even more extreme, 9ff has got you covered. The German tuning firm has emerged as the be-all and end-all of Porsche tuners, and is backing up its reputation with what it calls the BT2. Based on the same flagship supercar, 9ff has extracted a mind-boggling 850 horsepower to drive its super-sled up to 240 miles per hour, passing 60 in just three seconds. They've topped theirs off with carbon fiber body panels to reduce weight and an aerodynamics kit to keep it planted on the road, and painted this demo model in classic blue-and-orange Gulf livery. Nice work if you can get it.