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      12-01-2012, 12:05 AM   #3
135i_vs_
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Drives: M5, 135i, 335d, F10 550xi
Join Date: Sep 2011
Location: CT

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I asked the same question to myself; if the tunes actually prevent these rubbish carbon build up problems. I plan on getting the JBD next week. I pick up my new 2010 335d tomorrow.