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M5 Exhaust flapper mod demonstrated
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12-27-2014, 12:16 PM
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Mscarpa
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Drives: 2014 M5 Black on black!
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Gents - I had my exhaust valves tied open earlier in the summer and the extra sound is just about right. Sounds a bit more aggressive. Just used some medium grade wire and it has been solid. It is worthwhile.
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