There is rare and then there is rare. If you are the sort of person who likes their steaks bleeding off the plate then do we have two motor cars from you, both due to be auctioned by RM Sotheby's. A Cizeta-Moroder — actually the only Cizeta-Moroder — or a RUF Porsche won't be for everyone — don't expect your local mechanic to have the parts in stock if you have a small parking incident, for instance — but these beasts are not only super-fast but effectively bespoke. Expect maximum attention every time you turn a wheel. Now, which will make you feel love?

Cizeta-Moroder V16T | Year: 1988 | Engine: Six litre V16

Everything about this car, just everything. Let's start with the "Moroder" bit. That's Giorgio Moroder, the car's owner, Cizeta investor — and, just incidentally, the godfather of disco who's worked with everyone from Donna Summer to David Bowie. This very Cizeta is the prototype, the show car and the only one to bear the Moroder name. Hot stuff, indeed.

As you might expect, the one-of-a-kind interior is in the deepest red leather available, so sitting in it is — we imagine — rather like being in Studio 54 in the glory days of disco. Also: just look at it. The design is by Marcelo Gandini, who penned the Lamborghini Miura, Countach and the Lancia Stratos, among many others. The engine is unique to Cizeta, a V16 that's about as excessive as a remix of one of Mr Moroder's many dance floor classics. 

Cizeta was the brainchild of former Lamborghini test driver Claudio Zampolli. After a chance meeting in Los Angeles, Giorgio Moroder helped finance Zampolli's dreams. The reward was his own bespoke machine, one of just nine Cizetas made. Now fully recommissioned after many years in storage, the Cizeta-Moroder V16T is a monument to visionary engineering dreams. And, of course, to the undisputed genius of the king of the dancefloor. Worthy of a night club all of its own.

Porsche RUF BTR III  | Year: 1985 | Engine: Turbo-charged flat six

Now, here's a brute. If it looks like a Porsche, put that thought to the back of your mind. RUF have been around for decades, first modifying Porsches and then effectively building their own, using a bare Porsche chassis and RUF parts. This is one of those cars, one of just a handful.

A handful it might just be on the road, too. RM Sotheby's have released scant details so far of this particuar beast, but the BTR III was the ultimate RUF version of Porsche's already not-so-tardy 930, only with the volume turned up to 11. Expect a bored out version of the famous flat six at the back, a more powerful turbo-charger and uprated brakes to cope with it all, among many other under-the-skin RUF modifications. Oh, and the substantial bodykit you see here.

The car presents in immaculate and surprisingly subtle deep blue with blue leather interior. Given you're not actually driving it - these RUF Porsches make a fair amount of very loud noise reputedly - it can even be viewed as something of a sleeper: to the untrained eye just another 911, to the aficionado a made-to-measure driving machine. BTR, by the way, stands for Group B - the frankly insane racing rules briefly in force in the 1980s - Turbo and RUF. One for roughing up just about anything else on the autobahn. 

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