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underdrive pulleys?
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10-20-2013, 09:06 AM
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Mirko
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Drives: E86 Z4M, E90 328i, E84 X1
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I had them on my 330ci and liked them. Not sure if they did too much but I felt like the rpm's climbed faster from about 4.5K to redline. I've held off getting them because I can't make up my mind of staying NA or getting a blower.
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