The Dinan S1 M5 Is How An Obsessed Tuner Builds A Better BMW

I've never warmed up to the new BMW M5. Yes, it's got gobs of torque and toys galore, but it still feels like a warmed-over 550 – a bit of a punt on a marque that deserves more. Steve Dinan tends to agree. Not just because his business depends on it, but because he's obsessed – and I don't use that word lightly – with… » 10/09/14 12:00pm 10/09/14 12:00pm