E46Fanatics - View Single Post - opinion needed: UUC underdrive pulleys
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Old 03-12-2010, 11:46 AM   #5
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Join Date: Apr 2008
Location: Boston
Posts: 4,971
My Ride: 2003 325xi
I have them, and did notice a difference. Steering is tighter, throttle response is better.

It's not a huge difference.

I wonder if running without an AC belt would also make a difference.
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