These were some of the audio files I took just after I put my exhaust.
turn up your speakers and you'll hear them better
http://media.putfile.com/New-Launch
http://media.putfile.com/New-Idleinside
http://media.putfile.com/New-0-60KM
vs. old/stock exhaust
http://media.putfile.com/Old-0-60KM
http://media.putfile.com/Old-Idle-From-Behind-Car
These are a couple other videos:
http://media.putfile.com/Idle-24-94
http://media.putfile.com/From-behind-car
http://media.putfile.com/0-70km-Video