The SCR 4.2 utilises the Porsche 993's body-in-white and its multi-link suspension but has extensive use of carbon-fibre in its body work and an integrated roll-cage with the car looking akin to the Porsche 964. The SCR 4.2 utilises the water-cooled "Metzger engine" found in the Porsche 997 GT3 but has its capacity increased to 4.2-litres and its power output increased to and of torque. Power is sent to the rear wheels via a 6-speed manual transmission with limited slip differential, enabling the car to accelerate to from a standstill in 4.1 seconds and on to a top speed of . The interior of the car is driver focused and features the dashboard from the Porsche 993, racing bucket seats with 6-point harness and carbon-fibre, Alcantara and tartan trim. Like the original SCR, the SCR 4.2 features a whale tail rear wing and a front bumper with round brake cooling ducts. The car has a total weight of . At the 2018 Geneva Motor Show, exactly 40 years after the original SCR was introduced, Ruf introduced a new version of the SCR. The new SCR is based on the same principles as the CTR, introduced one year earlier, which includes parts built for the car from scratch. The new SCR has carbon fibre body work, an integrated roll-cage and a 4.0-litre naturally-aspirated flat-6 engine based on the unit found in the Porsche 911 GT3 RS 4.0, generating a maximum power output of and of torque with a red-line of 8,200 rpm. The car has a 6-speed manual transmission directing power to the rear wheels and an in-house developed push-rod suspension system. The optimum combination of power and weight propel the car to a top speed of . The car also has a carbon ceramic braking system for enhanced stopping power, with six-piston calipers at the front and four-piston calipers at the rear. Unlike the original SCR, the new SCR lacks the whale tail wing and features body work akin to the Porsche 964. The car was unveiled in the same shade of green as the original SCR, commemorating 40 years since the SCR's launch.