I weigh 220lbs. one of my ridding buddies weighs a buck sixty. We both ride '06 YZ450's. We race, switch bikes, race again. The two bikes run exactly the same. So my 2 cents echoes everyone elses. My budy spent 80 on a quickshot I spent 80 on a skid plate and we both somehow got the same boost in usable power. I would go with the skid plate.