west

I'm about to pull the trigger on an underdrive pulley for my 550 and was wondering if anybody who has performed this mod has positive or negative comments regarding the pulley? I know this is not a super popular modification for non-M cars, so I am specifically interested in hearing from the non-M car owners out there who have done this mod.

Here is one for the 535/545, but I think I'll give it a shot on the 550 unless anybody has evidence why it wouldn't work on the 550.

Here is another photo of it:

rolly888

i was also looking aat that for my 550i

cleung

I had them on my e46 they were ok not a really huge noticable difference. My only tip for you is to make sure you don't get a kit with a pulley for the alternator, our cars have far too much electronic stuff to afford any less power from the alternator.