The new Porsche 911 GT3 RS is out. This is the second and final GT3 RS that will be based on the current 991 platform, which is set to be replaced by a 992 generation later this year. What a bow out for the ultimate motorsports Porsche for the road.

The 4.0 litre six-cylinder naturally aspirated engine has been massaged to put out 20 hp more for 520 hp at 8,250 rpm. The same engine in the previous GT3 RS and current standard GT3 is rated at 500 hp. The gains are from new intake and exhaust systems, as well as tweaks to the engine management. The flat-six, which revs to 9,000 rpm, is mated to a seven-speed dual-clutch PDK automatic gearbox. Like before, there’s no manual option.

The GT3 RS accelerates from 0 to 100 km/h in 3.2 seconds, which is a tenth faster than the car it replaces. Top speed is up slightly from 310 to 312 km/h.

Autocar reports that the engine actually develops more power than is claimed and could have been homologated at 530 hp, but Porsche decided to err on the side of caution, quoting Porsche GT boss Andreas Preuninger. In race spec, if allowed to run without air restrictors, the flat-six could make more than 600 hp.

Motorsport technology for the chassis include ball joints on all arms (for greater precision over conventional elastokinematic bearings), 20-inch lightweight wheels with newly developed 265/35 tyres on the front (enhances agility and steering behaviour) and 21-inch wheels with 325/30 tyres at the rear axle. The rear axle steering has been recalbrated.

The UK mag adds that the new GT3 RS has the same spring rates front and rear as the turbocharged GT2 RS, launched in July 2017. At the front, the spring rates are double that on the current 911 GT3 and previous GT3 RS, and the rear spring rate is up by 40%.

The GT3 RS looks every inch a race car, thanks to the wide body and classic rigid rear wing. Inside, you’ll find full bucket seats made of carbon, lightweight door panels with storage nets and opening loops, reduced sound absorption and the new lightweight rear lid. The front wings and bonnet are in carbon, and the roof is made of magnesium.

Owners can take the diet one step further with the optional Weissach package, which features additional carbon components for the chassis, interior and exterior (CF roof), as well as optional magnesium wheels. In its lightest configuration, this pack reduces the weight of the 911 GT3 RS down to 1,430 kg.

As with all current GT models, the Clubsport package is also available at no extra cost. The package includes a roll-over bar, a manual fire extinguisher, preparation for a battery disconnect switch and a six-point belt.

Wing aside, one can tell new from old by reprofiled front and rear bumpers with new vertical air flow guides within the outer ducts (front) and larger air extraction ducts (rear). Order books for the new Porsche 911 GT3 RS are open now. It will be launched in Germany from mid-April.