I had the akra and on its own it's ok, coupled with the headers it used to do my head in and I wear ear plugs as well, I used to get off my bike after a day blating across France and feel fooked and a
had a buzzing in my ears.
Obviously it's bigger then stock, there's no gain on its own and Deffo not value for money at £700 but it's like being in a sweet shop and I want everything, if you can afford it buy one and come trade in time take the can off and sell it you'll get 70-80% return .