1974 911 Carrera RSR Turbo 2.1 liter with exposed single turbo which produced 500hp. The road car derived RSR 2.1 came second at the 1974 24 Hours of Le Mans, beating a
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Le Mans Legend: 1974 Porsche 911 Carrera RSR 2.1 Turbo to be auctioned | Hemmings
1974 Porsche 911 RSR Turbo on track and all 911 Turbo road cars from 1975 to 2018 - Drive