Getting a slight increase in top speed,accleration is better across the whole range,the noise is rated at grin factor 10! We chased a guy on a KTM along the A10 last saturday,he had carbon fibre Akropovic race cans fitted,we couldn`t hear him,we caught him at the Hardwick roundabout,he said all he could hear was us.look out! Here comes THUNDER!

I have taken to wearing ear plugs now,when its running at full chat it sounds like the world is going to end!