Back To Back Audio Comparison - 2017 and 2020 Porsche 911 RSR Testing at Algarve International Circuit 3 November 2020 Proton Competition roll out their new 2020 spec GTE Porsches with one of the original 2017 cars also on track to allow some back to back comparisons of how the new exhaust configuration affects the sound of the new cars. Drivers: Richard Lietz, Michael Wainwright, Felipe Laser, Michael Fassbender