Don't run stock pads on track days either. Here is how mine looked after 2 track days and 6k miles. Cracks all over them.
url=http://www.flickr.com/photos/38941112@N05/6867104683/]
[/url]
IMG_0618 by
baldadar, on Flickr
IMG_0615 by
baldadar, on Flickr