When I bought my 400 brand new back in '05 I managed to rip the stock plastic skid off of the swingarm in about 10 minutes of riding on my local trails. And not just one part, the ENTIRE thing got ripped off. The only thing that was still on was where the bolts were holding it on. I immediately replaced it with a Pro-Armor that lasted up until last year when I installed the GT link and had to get their skid.