I just changed the cans on my storm (std to ART) and the fuel economy has improved from about 33 to 39 mpg !!
Is this normal ??? Its been set up properly and is running properly, its actually much smoother and definatley feels more powerful on the road.
At this rate the cans will pay for themselves in about 40.000 miles, bargin.
Yes mate mine did the same. However they won't pay for themselves at all. Reason being that you will over blip the throttle all the time because the sound is so addictive. Also you might end up pay the W*****S in blue(coppers) the odd £30. Enjoy welcome the world of sweet twin music.