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      03-11-2013, 07:30 PM   #7
maesd74
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Drives: 2011 M3 sedan comp package
Join Date: Apr 2012
Location: Denver, CO

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I have Turner's...A) because my cousin (bike racer and m3 enthusiast) is sponsored by them, and B) because they were $350 on sale.

They all do the same thing and are all quality products (given the brands you listed).

Either way, you'll enjoy the increased power with the minimal cost.