Originally Posted by Mike Benvo
An exhaust leak is usually not a hissing sound. Usually when you have an exhaust leak you know it.
Maybe you can record a sound clip or video? My car w/ full Akra doesn't make any hissing sounds. Just roaring on a rampage sounds
Do you have a filter on your car. Im starting to think that maybe this is intake noise that has now been enhanced by the front pipes.
2011.75 E92 MW/BB extended,ZCP,ZP2,ZCV, IPOD,BMW APPS, Heatedseats,6MT, Edition Black Chrome Grills & Side Gills, CF splitters, CF performance spoiler, CF mirror caps, Turner black anodized pedals, Akropovic Evolution exhaust w/CF tips, Still Undecided on tune, AFE Pro5r, AFE intake scoops, LUX H8
2009 E92 JB/Black 335 xdrive (retired)