So I'm getting this ticking/cracking sound when recording my exhaust on my car. Anyone know why that is? It seems that maybe if I'm off to the side of the car it's not as bad. And it only seems to do it at a certain rpm level. Here is a test video to show what I'm talking about.

Thanks for any help!

http://www.youtube.com/watch?v=OZLXr6VTW4Y