CHANGED PLUGS at 48,200 and even though I found many post saying to go NGK or BMW OEM - I went with the Bosch Part # ZR5TPP33-S
They look the same with the exception : BMW R6 / Bosch R8 although the part numbers are the same.
I doubt I will be able to tell the difference -- wonder if there really is.
Bosch cost half of the BMW labeled plugs and then if you factor in the FCP Euro warranty - about 75% less.
.
.
Cheers! Happy 4th!