i have an '08 mcs with sport, lsd, and a manuel tranny. i have about 10,000 miles on my mini and am considering upgrading with the "jcw" engine upgrades. can anyone give me some impressions of the improvements in the low, medium, and high rpm ranges, and the effect on cruising fuel economy?

 

It is currently only available for MC-S built before July 2008. All MC-S produced after July 2008 have to wait for the new JCW Engine tuning kit to be released sometime in September (hopefully). You can find lots of info on the kit by searching in the Modifications section....