Thread: Best Pulley
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      10-18-2012, 11:06 AM   #37
tom @ eas
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Quote:
Originally Posted by ussoldierforhire View Post
I think the difference is negligible. Macht Schnell claims gains of 9-14hp and AA claims 12+ hp. Both claim factory harmonics stay in tact. Only differential I see would be price and AA has a $50 off sale right now.
Major differentials are the AA is single pulley system and uses a proprietary belt. MS uses two pulleys (not affecting A/C operation, which would also spin slower during everyday driving) and normal off-the-shelf belts for when replacement time is neeed (normal maintenance).

Just things to keep in mind when shopping.

Quote:
Originally Posted by tbone28 View Post
Forgive the noob question here (my 1st BMW)...I'm coming over from the mercedes world, where I read enough stories (to make me worry) of aftermarket AMG pullies falling off.

Is that a concern on M3's?
Not a concern since the BMW pulley is separate does not disturb the harmonic balancer.
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