Porsche has pulled the covers off a track-only edition of its 911 sports car, called the GT3 R Rennsport.

Revealed this week during the Rennsport Reunion, a meeting of Porsche enthusiasts at the Laguna Seca race circuit in California, the 911 GT3 R Rennsport is not competition-legal. Instead, it is an example of what’s possible when the racing rule book is thrown away, along with any desire to comply with street legislation.

Let entirely off the leash, Porsche’s motorsports division has come up with what could be regarded as the ultimate interpretation of the 911 sports car. Although based on the current 992-generation 911 GT3 R racer, the new car’s body shell shares only its roof and hood. Changes include a dramatically updated aerodynamics package, highlighted by a massive rear wing and aggressive underfloor diffuser.

Limited to just 77 examples and priced from $1 million, the new Porsche is powered by a 4.2-liter, flat-six engine related to that of the company’s GT3 R race car but no longer restrained by motorsport’s Balance of Performance rules. This allows it to generate 611 horsepower, an increase from the race car's 564, and rev up to what will surely be an ear-splitting 9,400 rpm.. Porsche has set a target weight of just 1,240 kg (2,733 lbs) for the single-seat car.

With an eye on sustainability, Porsche says the GT3 R Rennsport can run on E25 fuels, including bio-ethanol fuels and e-fuels produced in a carbon-neutral way. The engine sends all of its power to the rear wheels via a six-speed ‘constant-mesh’ transmission shared with the GT3 R race car.

The carbon-bodied Rennsport also features a race-bred, unsilenced exhaust system with two tailpipes that Porsche says produces an “extremely emotional engine sound.” The company says two additional exhaust systems will be provided with the car, equipped with silencers and catalytic converters to ensure compliance with noise restrictions at certain race tracks.

Porsche says the GT3 R Rennsport shares a chassis that is “essentially identical” to its GT3 racing car, featuring a state-of-the-art double wishbone suspension at the front and a multi-link setup at the rear. There are also five-way adjustable shock absorbers, and the car is fitted with a set of Michelin race tires offered exclusively to the 77 lucky GT3 R Rennsport customers.

Other features include fender-mounted cameras instead of side mirrors, sending their view to a pair of displays inside the cockpit, and a single bucket seat with harnesses and surrounded by an FIA-grade roll cage. Ahead of them, the driver is greeted by an all-digital dashboard, banks of controls lifted straight from Porsche’s GT3 race cars, and a steering wheel festooned with buttons and dials.

Not usually one to let itself get carried away, even the German automaker admits the resulting car is “probably the hottest track tool Porsche has ever made available as a collector’s item.”

Let’s just hope those 77 collectors use the car as intended, and perhaps we’ll see the odd 911 GT3 R Rennsport carving its way through the competition at a track day soon.