don't know anything about bmw's but I do know turbos, in relation to Saabs tho. It may be cheaper to get a second hand one, tho you then don't know its quality/history I spose. Yellow pages.....bm specialists (not dealers) or turbo specialists.
seriously now ring Quarry motors in Sheffield.........link... http://www.quarrybmwspares.co.uk/</p> they are always breaking BMW's and have always been extremely helpful to me</p>