We gained nearly four horsepower and considerable torque after installing FMF's Apex slip-on exhaust. Total install time was less than 30 minutes, and can be performed with the most basic of hand tools.
The exhaust is available at www.fmfracing.com for $549.99.
 Remove side panels to access...  Remove side panels to access seat bolts | 
Side panel removed | 
Remove 2 seat bolts |
 Under the seat is the servo...  Under the seat is the servo motor. Use a flathead screwdriver to pop off the snap holding the servo cables tight |  Remove servo cables from ...  Remove servo cables from pulley |  Feed servo cables through...  Feed servo cables through frame, and pull out where they attach to muffler |
 There's a small hook behind...  There's a small hook behind the brake reservoir holding the servo cables in place, they'll loop under and out |  Next, remove the heat shield...  Next, remove the heat shield on the muffler, there are 3 bolts. You won't need this for reinstallation, so put it on a shelf somewhere | 
Remove heat shield |