Right now, Singer is the talk of the town when it comes to gorgeous resto-modded Porsches. The cars reimagined by the company are like the ultimate evolution of a classic 911 ST. It's not the only restoration shop around, though, because RUF has tuned Porsches since the mid-1970s. The German company brought a handful of heavily modified 911s to the Geneva Motor Show that could only be described as stunning.

In 1987, RUF brought its CTR Yellowbird to an ultimate top speed shootout undertaken by this very publication and wiped the floor. The Ferrari Testarossa, Porsche 959, Lamborghini Countach and others were forced to bow down before the mighty Yellowbird, which used its 469-hp turbo flat-six to reach a top speed of 211 mph. The Yellowbird put RUF on the map.

Three of the cars it brought to the Geneva Motor Show–one based on a 964 chassis, one based on a 993 Twin Turbo and another riding on RUF's own seven-millimeter longer chassis–are very much in the spirit of the Yellowbird, but with the advantage of modern technology. RUF rebuilds and refines nearly every element of a classic 911 to create something that inspires unparalleled lust.

Chris Perkins

Sitting pretty in a lovely color RUF calls Blood Orange is its new SCR 4.2, which made its debut at the Geneva show. It looks more or less like a late '80s 911 Carrera, but it rides on its own, RUF-designed platform that's seven millimeters longer than stock. The car RUF brought to the show is a prototype, but the final version will have a carbon fiber body shell that weighs only 24 lb.

Chris Perkins

The SCR 4.2 has a curb weight of just 2646 lb with a roll cage thanks to its carbon body shell as well as its carbon hood, front fenders, door panels and engine lid. A car this light doesn't really need huge power, but RUF gave it huge power anyway. A naturally aspirated, 4.2-liter water-cooled flat-six makes 525 hp with a screaming 8500-rpm redline and power is sent to a 6-speed manual transmission.

RUF doesn't have acceleration figures, but it claims top speed will be 200 mph.

Chris Perkins

Like Singer, RUF specializes in nailing subtle styling details. For example, the rain gutters typically found on a 911's roof have been removed in this car. The seats are carbon-backed buckets, but the wild black and white pattern is a reference to seats Porsche offered in the 911SC.

The SCR 4.2 is yours for $527,664, plus options, of course. Somehow, this car isn't the craziest of RUF's resto-mods: For a crazier car, you'll need a turbo or two.

Chris Perkins

The Ultimate rides on the same wheelbase as a 964, though its a dramatic departure. Like the orange car, the Ultimate uses RUF's carbon fiber body, so weight is nearly identical to the SCR 4.2, at 2679 lb. That's impressive because the Ultimate uses a 3.6-liter twin-turbo air-cooled flat-six engine that makes 590-hp. It doesn't rev quite as high as the naturally aspirated unit in the SCR, but with 590-hp, it's doubtful you'd care.

One of RUF's salespeople told me that the company's philosophy is to "re-engineer everything, but stay understated." Wearing a gorgeous coat of Mexico Blue paint, people will notice this car, but hardly anyone will guess it has that much power hung over the rear axle. To most, it just looks like a classic 911, but serious car geeks know its something truly special.

Chris Perkins

RUF uses ceramic brakes in the Ultimate, which is a good thing because top speed is quoted at 210-mph. Even though its a bit faster, the Ultimate is actually a touch more affordable than the SCR 4.2, with a starting price of $472,699. Affordable is a relative term here.

Chris Perkins

If you want something even more exclusive, RUF will sell you the Turbo R Limited. Actually, it won't since it's only making seven and all are sold out. Of the three cars profiled here, this is the heaviest at 3175 lb, but that shouldn't be much of an issue either because the Turbo R limited extracts 620-hp out of its twin-turbo flat-six.

The engine block comes from a 993 Turbo, but as is RUF's wont, most everything else is changed. Top speed is 212, which matches that of the 1998 Turbo R. Like the Yellowbird, the 1998 Turbo R won our high-speed shootout. Unlike the 993 Turbo its based on, the Turbo R Limited is rear-wheel-drive, though RUF will make it all-wheel-drive if you'd like.

Chris Perkins

RUF's salesperson told me that it actually sold the last example on the second press day at the Geneva Motor Show. Prices start at a fraction under $600,000.

These cars make Singer's gorgeously modified 911s look cheap, but the result is a classic 911 that'll make even a 991 Turbo sweat. Their appeal is somewhat different, so we won't pass judgement on whether a RUF or a 911 reimagined by Singer is the ultimate 911, but I will say I had trouble forming complete sentences while checking out these RUFs.

Chris Perkins

Chris Perkins

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