Does not look like it affects the bottom end - i.e. you dont have to rev the nuts off it.
Dont know what they mean about the exhaust lifter as it does not have one, unless it is some kind of automated one to help with starting.
Dont agree about the comment about the extra tooth - I have already fitted one to mine and it pulls it with no problems, so perhaps could go another one, but not sure if the space is there to to do it.
£166 is a fair bit to outlay, but looks like you do get a decent return.
I would like to see some reviews from people who have fitted them, but I guess that will be a while.
Something to think about - site has been bookmarked.
Thanks for that.