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      01-18-2013, 06:07 PM   #3
jmh
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Drives: F10 M5/F32 435xi
Join Date: Mar 2006
Location: Under a rock in NH

iTrader: (4)

Not sure you'd gain much as there's pretty much nothing in the stock mufflers .

But if you're happy to donate your mufflers to research give it a try
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13 F10 M5 Individual / Brilliant White / Extended/Full Cohiba Brown (Exec/Driver/B&O/20") / A few Euro add-ons / Stealth K40 / Upgraded B&O / ///M Performance Carbon Interior Trim / Color matched side and front grills (lightly tinted LEDs) / Akrapovic Evolution Exhaust / Hartge Springs / HRE S107