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Valve Cleaning?
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11-21-2012, 12:57 PM
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JDM NA2
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Drives: 09 335i e90 M-Sport
Join Date: Oct 2012
Location: CA
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It's called walnut shell blasting. Check out this link.
http://www.e90post.com/forums/showthread.php?t=732369
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JDM NA2
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