Scion pins pocket-rocket hopes on iM Concept

Making a concept car can be pretty straightforward: big engine, crazy design, outlandish interior papered with touchscreens, and then set your auto-responder to "we have no plans to commercialize this vehicle." When you're Scion, though, and want to make not only a concept that's in keeping with your low-cost pitch as well as something which will translate to a probably-not-much-different …