Heated leather seats
Different front splitter
Different downpipes and a different gearbox too, which IMO makes the biggest difference. And the gear change indicator comes in at the redline. is it a different airbox as well ?
Worth pointing out that its only the 2011 s1600 / metal that have the performance changes. The 2010 one was just cosmetic changes.
I have driven the 2010 and the 2011 in the same day and there's enough difference between them to warrant going from a zs to a metal ( same scenario, different shape)