2007 Honda CRF150R M-7 V.A.L.E. Stainless Steel Full Exhaust Systems: With the patented use of magnesium, titanium, aluminum and stainless steel and hours of testing we have come up with an exhaust system to win races. Increased throttle response, more power throughout the powerband, and lighter weight all add up to a winning combination for the CRF150R. Now featuring our exclusive patented X-Lite retaining ring.Factory installed U.S. Forestry Service approved screen type spark arrestor included.