the kit in the picture is made by infinitas and cost about $5000, after import fees and and imbalanced Dollar to Euro conversion it's just not worth it. they can be found on the bimmer forums, as I doubt any euopean company is pushing crossfires, this is for the mercedes m112 and m113.
you guys should wait for Chucks Eaton SC, as it produces a flatter power curve and more boost at lower rpm's due to the eatons larger volume vs the dinky centrafugal set up. exspect to loose another 2mpg with the big eaton.
here is the infinitas site, I believe this is the SK1 kit http://infinitas.co.za/ tell them you own a c320 or slk320, I would guess they still have the parts.