Porsche has been showing its 991 GT2 RS to a select group of journalists in Germany. Auto Motor & Sport put out a video showing the launch control in action, but it seems that no one actually got to drive it; everyone rode in the passenger seat. Gone are the days when Porsche gave Kacher the keys to a prototype for the weekend.

The fastest production 911 ever has not yet been fully homologated, so the numbers are vague. For the sake of discussion:

• 0-60: under 3 seconds
• 0-124: under 9 seconds
• Power: more than 650bhp
• Weight: under 1500kg
• Weight savings include using smartphone Gorilla Glass
• Lightweight Weissach pack lifts 30 kilos and will cost a small fortune
• GT2 RS will cost more than the house I am writing this in

Looking at 911R/GT3 RS trends and allowing a bit for the GT2’s rarity, we can roughly predict what will happen with prices.

Say the GT2 RS sells at £250k including Weissach pack, it will top £450k within 6 months of release, probably over twice list price for a while. There is no doubt of this. City traders are earning well over a million quid a year now in the City of London and a GT2 RS will be the big thing. The hunger for GT2 will be strong, so £500k is totally happening.

Once they’ve gone through a 12-to-18-month honeymoon, prices will settle somewhere around £100k or so over list, as the next big thing will be out. If you don’t buy one of these cars brand new, you will probably never be able to buy it for list price. So why should you care about this particular example?

Well, look at the photos. This is a mule: a GT3 RS finished in Lava Orange with a tweaked engine from a 991 Turbo S installed. Engineers hacked the tail about a bit, vinyl wrapped the whole thing in black then screwed some bits to the sides to cover the turbos, drilled a load of heat holes in the rear bumper, made a swanky exhaust and the boss ragged it back and forth from home to work for a few months. It is sweaty, scratched and slathered in duck tape: everything a production GT2 RS will never be.

The new GT2 RS in a showroom will just be another unobtanium Porsche that gets professionally detailed twice a year to take the dust off and occasionally turns up at cars and coffee meets to entertain those who don’t get proper old cars. But the GT2 RS development mule – that is a hot rod from Stuttgart and these are the sex kings.