I'm going to give k-tec a call and see if they know.
Just to clear up from my previous post if it was unclear. I was noise tested with the standard exhaust and at 5200rpm that produced 92DBs.
EDIT:
Just spoke to to k-tec they don't know how loud it is. Looks like i'll be getting my mum to call orbisoud then. I wonder how much they cost if you buy directly from them!!!