Well I finally did it, Fell over and the nice stock stainless muffler made a direct hit on a rock, big dent and all scraped up. Its like seeing your own child hurt and bleeding, I can't stand to look at it. So now I'am looking for a replacment, my last two four strokes a DRZ400 and A WR400 both had the White Bros. E-Series S bend and I loved it. What I liked was that you could tune the sound with removing and adding the disc's, I was running 8 disc's which gave me good bottom end and wasn't too loud, I don't know if it would have passed the new 96DB limit, but it wasn't bad. Anyone else tried one on the WR450?