I looked at the site and have some interest, but I wouild have to know the hp limits for this diff and warranty etc. Has anyone here seen this fiff used on another MB? I would be curious to see if it interfered with the trac control and the electronic stability program. It looks like we do need a mod for the rear if we plan on tracking these cars. I really didn't expect that. I was under the impression that MB typically overbuilt them. Oh well, live and learn. Experience and real world examples trumps impressions every time. LOL Anyone actually drove an MB car or another car with a similar electronic traction control like ours to compare best times with it, vs. the wavetrac? I am wondering how much of an impact it will have on our handling as well.