Ah, the UK's wonderful MOT noise test. I once had an Aprilia Falco with the full racing carbon cans fitted. The MOT guy I use in Wokingham just sat there blipping the throttle like mad because he loved the noise. He asked me if I had the original cans, I said yes, so he passed it
Said he knew it was a waste of my time swapping the standard cans over, having the MOT, then immediately swapping them back.
The baffles should do the job on the Akra's (mine are the Evo's) and they are really respectably quiet when fitted.