thanks, to be honest i reckon its pretty smooth any how, but it had 15 toof sprocket allready, on so not sure how that would be with 16, my sd was very fluffy fueling so this is bloody great. im still wondering what cans to go for too! like them akky ones...but they got cats in them doh, ones with out im not so sure really, fancied something bit shorter, looked in the zaust thread on here still not sure, no hurry i spose