Next step, you can let somebody rev the engine while you put your ears close to the pulleys and see if it gets louder. If you can pinpoint the pulley that'll be the best.


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01' 3.0i E53 (M54) with 164,000 miles
07' 3.0si E83 (N52) with 134,000 miles
08' 3.0si E70 (N52) with 91,000 miles