Did the same thing here, racing an Audi RS4 at 130 mph...
http://i49.photobucket.com/albums/f279/cmaines01/plug.jpg
http://i49.photobucket.com/albums/f279/cmaines01/plug2.jpg
Saw 16* of knock on my scanner, then the check engine light came on. Multiple cylinder misfire. LOL, luckily there was no damage to the heads, pistons or valves. I hope the same goes for you!