Hi Marv,
The BAR data is just a guess, but looking at real oem parts listing and comparing my last 7 VIN on both my cars (M3 sedan & 318ti) ...
http://realoem.com/bmw/showparts.do?...03&hg=16&fg=15 M3 model, Item #11 Supplement info 3,5 BAR
http://realoem.com/bmw/showparts.do?...03&hg=16&fg=15 318ti model, Item #11 Supplement info 3,0 BAR
I've read in several forums Real.oem can be misleading or very generic. Again, I have no clue if this BAR info is accurate.