Single turbo V6 with a 60-degree Vee is the worst possible engine configuration because you have to run the exhaust header all the way around to the other side. It has terrible packaging, efficiency, and response. It is not going to reduce any cost because of extra R&D and the lack of parts sharing: different header, plumbing, intercooler, and turbo. That's why all modern 60-degree V6s are twin turbo. It's much easier and cheaper to just detune the twin-turbo engine. The only feasible layout for single turbo six cylinder is either Inline-6 or 90-degree V6, neither of which can be used on a transverse platform.