I was listening to a biking podcast yesterday that said the S1000XR has an air bleed system in some models to increase the popping/banging on the overun and it got wondering if there was a similar system in the S1000RR and if in which gen's it was in? I am looking at getting an S1000RR after owning solely Japanese superbikes before and have always thought they sounded tasty on the overrun!