Ok I'll start by apologizing. I don't own a GoPro/Contour..YET and could not find a passenger on short notice to hold the DSLR. So, I wedged it on the dash in front of me. I also have a cold, so excuse the breathing noises. This is just me cruising normally from a store to my house, I top out at a whopping 65MPH! It gives you a great impression of the tame side of the exhaust that most of us would experience everyday - there is more road/tire/wind noise than exhaust note.
I still recommend anyone interested go sit in a car with the mod, you'll be sold within the first minute
It struck me when I got home that some tape and my iPhone mounted on the visor may have been a better option. I'll give that a try on the way to work tomorrow.
For now...