The SLR uses a 5-speed automatic and was never offered with a manual, which the community treats as the single biggest drag on its collector value versus the manual Carrera GT. Commenters repeatedly speculate the car would be worth two or three times as much, or a genuine million-dollar car, had it come with a stick.
Five-speed automatic and the missing manual
Mercedes-Benz SLR McLaren (C199) · mechanical