Has anyone ever pieced together a custom single turbo setup layed out similar to the STS rear mount kit? Looking at used/reconditioned turbo's and wastegates on e-bay, and seeing that I'm already an HP Tuners owner, I couldn't imagine that with some DIY work, a used turbo, and a wideband O2 it would add up anywhere near the STS MSRP. Another note, a custom supercharger setup would be cool too, except used/loose superchargers (centrifugal) are pricey.