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      02-09-2013, 07:20 PM   #2
PR3CI5N
need4speed
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Drives: 2010 E90 M 335i
Join Date: Jun 2010
Location: West Coast

iTrader: (19)

They work pretty well but over time they'll turn your spark plugs orangish/yellow. To be honest though octane booster is old news, try a few gallons of E-85 and you'll really feel a difference.
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