View Single Post
      03-14-2013, 01:41 PM   #25
Internet Crash Test Dummy
jmh's Avatar

Drives: F10 M5/F32 435xi
Join Date: Mar 2006
Location: Under a rock in NH

iTrader: (4)

Originally Posted by ColdList View Post
Well that puts a decisive end to that!

Just making sure this is read correctly...To clarify (and correct me if I am wrong) the exhaust valves being wired open has no side effects other than louder note (slightly). That was my experience. There si no hissing or humming whatsoever. Now having modified OEM without valves and different piping it sounds fantastic.

Correct (on the side effects)
I think the hissing/humming is something some very sensitive drivers might hear. Probably not folks looking for a more pronounced exhaust note
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