Singer’s Porsche 930-inspired Turbo Study can now be ordered as a convertible

California’s Singer has revealed a convertible version of its Porsche 911-based Turbo Study just in time for the car’s U.S. debut at 2022 Monterey Car Week. Shown for the first time as a coupe in February, the Turbo Study is the latest member in a growing family of 964-generation 911s modified by Singer, with the focus this time to make something…