The 15 tooth front sprocket is probably the cheapest mod available for the 700, and one that makes a noticeable diffrence on the trails. The stock raptor has a mountain of torque, and cannot apply it in the first two gears becuase of the exessesive wheel spin. The 15T applys that power to usable torque and speed on the trails.
The 15T is ~$20 mod, well worth the money for trails.
Aaron