And now for something completely different:
Wild 'Vette rumors come up all the time and most never end up panning out. Still, this one is intriguing because this type of setup would retain the V8 engine while lowering displacement closer to a 6 cylinder. I've brought this up in the past as something that I think would be cool for an M3 too. Best of both worlds - you get your small displacement turbo, but you still get the V8 engine note. It's a bit like what McLaren did, but taken down a notch or two to keep costs realistic.