I spoke with the Macht team, and here's what they told me. Basically, I’m supposed to have a smooth power steering pulley, not a grooved one.
Quote:
Hello,
The cars with the double-sided OEM belts use Continental Belts 6K1084 and 6K1432 with the Smooth Macht Schnell Power Steering Pulley.
The MS Grooved PS Pulley is for the M3 up to 05/08 production date and uses Gates K060410 and the Continental 6K1432. 06/08+ Macht Schnell Pulley Kit should have the smooth power steering pulley, with the belts I mentioned before.
Thank you!
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I looked up the Gates belt and that one is singles sided too. I think the grooved pulley is like he mentioned, for later year M3’s production models, and it probably runs over the the top of the pulley spinning it clockwise.