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Update....... swapping the pulleys and belt does not fix the issue. If fact I have found dozens of others now with down cars and no fix via BMW. BMW insists the 002 part works on all cars and it does not. If you have a early 2008 e9xm3 you will have this issue.
after we bought all pulleys and belts ($500) we found out the oil filter housing is now in the way and also has to be replaced (another $550).
We are going to order up a few single sided underdrive pulleys and see if we cannot get the proper clearance. we will have to source a custom belt going this route since we will be mix matching. A belt shouldn't be hard to get once you get away from the stock double sided belt and into a single sided belt
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