What's the scoop on changing out a stock underdrive pulley on a 99 2.3 z3 for improved hp. w/ a high performance pulley? Is this a mod that is worth doing? Feedback appreciated.
Happy New Year to all.
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i dont know about BMWs, but i just did one 2 weeks ago on my 97 GTP and it made a noticeable difference. Of course its BMW, you will prolly pay 150-200$ for the damn pulley. 
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On I6 engines, it is better to swap the accessory pulleys and NOT the crank pulley. The crank pully is part of the harmonic vibration dampening system.
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Steve Dinan has a pretty detailed article on this topic-
http://dinancars.com/whitepapersFile.asp?ID=5
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Underdrive Pulley