Hi, I've recently decated my 2010 S1KRR and left the CAT element still in the header pipes (too much faff to remove it) and went to Snetterton today and recorded 98db at the static noise test. I will add that I've got the butterfly valves in the open position and fitted a new Polish made Dominator HP1 end can (can be found on eBay and actually looks and sounds really good) and also fitted a K&N race air filter. I know the ECU is 'adaptive' and will recognise certain changes to the set up and adjust itself where necessary but I wanted to get the most out of the decat so I've installed a Rapid Bikes Evo Autotune fuelling module and by 'eck does she now feel smoother, more powerful and full of life!!!!
cheers , Andi