This was taken with digital photo camera so not the best but gives you idea of noise inside car with windows up. See sig for exhaust set-up.
http://videos.streetfire.net/video/2...8100f6d9e1.htm
Here's another with window down. Not sure if this video shows anything(all I could see was a green screen) but you can definetly hear it. Got a little wind buffeting towards the end there.
http://videos.streetfire.net/video/b...8100f441e8.htm