Botond was looking for someplace that offers a comprehensive conversion - http://www.zionsvilleautosport.com/store/shop.mv?Screen=CTGY&Store_Code=6134&Category_Code=CKE $2395.00+ $929.00+ $689.00+ $195.00+ $495.00+ $1495.00+ $889.00+ $395.00+ $249.00+ $249.00+ $149.95+ $1495.00+ $49.00+ ------------------ $9673.95 for an M50 which needs to be converted to OBDI + $1995.00 for S50 upgrade ($11,668.95) or + $2995.00 for S52 upgrade ($12,668.95) Even if you can find any of that stuff for less, I would have to imagine that you still need all of it to accomplish the conversion, plus some serious fabrication skills to solve the various fitment problems that would almost inevitably arise. None of that includes any brake upgrades - you throw over 200hp into a non-M3 E30, and I think anyone would want some bigger brakes, plus probably some brake ducting and stainless lines. I think a 15" E30 brake kit is $1k-$1.5k, and 16" is more $$. It might be possible to pull it off for half of what they're selling, but I'd guess it'd take some serious bargain hunting to gather most of what you need. At a minimum, buy their Orca/OBDI conversion cd-rom, and you'll be able to see everything you're in for. Their cd's are copy protected and can only be installed once, on one internet-connected pc - if you need to refer to it in the middle of the project and don't want to have to keep running back to a desktop pc, install it on a laptop.