Have you considered alternative slip-ons like Pipewerx, I am currently considering them, seem pretty tasty
I've had a look around for others but nothing quite taken my fancy like the Akro - always wanted them. I have noticed SBS show that the previous 15 pipes fit the 16 as well, but not sure how accurate that actually is http://www.sportsbikeshop.co.uk/motorcycle_parts/content_prod/244952 says 11-15 at the top but then clicking on models this fits is shows 16 models too.