Hamann vs Akrapovic vs Stock Exhausts - BMW 4-Series Forums
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post #1 of 2 Old 04-24-2015, 03:33 PM Thread Starter
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Hamann vs Akrapovic vs Stock Exhausts

Check out the Rev Battle LOL...

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post #2 of 2 Old 05-16-2015, 08:42 PM
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Hamann is clearly the winner in this one, but I kind of figured that out in the first few seconds.... since it's at Hamann's facility!

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