Group C Porsche 962. And you can't say that about a Corsa VXR...
The original 911 GT1 appeared in 1996, and GT racing rules (and Le Mans regs) merely stipulated that a single roadgoing car be created. For 1997, however, the FIA GT World Championship required a minimum of 25 examples (including race cars) to be built. Hence the Strassenversion of the 1997 GT1, complete with then brand-new 'fried egg' 996 headlamps.
The car for sale here is purported to be the very last of the road car production run, which we assume is why it says it's a 1998 car (the 1998 GT1 that actually won Le Mans was a very different machine from the 1997 car, with extensively modified bodywork and a new sequential gearbox).
And that's the thing: if you're going to go to the trouble of getting something like this, why not go the whole hog and get a full-on racing car - something like this rather natty 936-based Porsche-Kremer CK5 Group C car?
On the other hand, if you are a card-carrying Porsche fanboy, and you simply must have it in your collection, we definitely see the appeal... even at $2,325,000 (£1.5m)...
PORSCHE 911 GT1 STRASSENVERSION
Engine: 3,163cc flat 6-cyl twin-turbo
Transmission: 6-speed manual, rear-wheel drive
Power (hp): 544@7,200rpm
Torque (lb ft): 443lb ft@4,250rpm
First registered: 1998
Recorded mileage: 4,900km
Price new: c. £550K
Yours for: £1,500,000