I just got a dual exhaust with 40 series flows, and only one word can describe them..D**M!! The stock system on V6's don't do a mustang justice at all!! The Flows really unlocked sound I never thought my stang could achieve. Most people say it takes a few weeks for the system to really break in, but in a few weeks it'll sound like a GT500:laughlitt !! I'll load a sound clip as soon as I get the technology!!