FMF 16-18 Kawasaki KX450F Q4 Hex Spark Arrestor Slip-On Exhaust: Automotive. Buy FMF 16-18 Kawasaki KX450F Q4 Hex Spark Arrestor Slip-On Exhaust: Complete Systems - ✓ FREE DELIVERY possible on eligible purchases. The FMF Q has always been in a league of its own and the latest Q4 is the most significant upgrade to date. . You don't need to settle for a plugged-up moto muffler hampered by an insert when you can have a compliant muffler engineered for performance.Less sound equals more ground.Meets U.S.F.S. . and FIM World Enduro sound regulations.Power gains throughout the entire RPM range.Spark arrestor included.Pounds lighter than stock.Rugged design for off-road endurance.Only U.S. . manufacturer to offer dedicated quiet exhaust systems.Can be used with FMF or stock O.E.M. . header.Made in the U.S.A.Note: For closed course competition use ONLY. . Not intended for street use.Detailed Specifications:Type: Slip-On.Configuration: Single.Construction: Aluminum.Finish: Natural.Midpipe: Stainless steel.Endcap: Stainless steel.Spark arrestor: Screen insert (included).Quiet insert: Included.Weight: 5.4 pou . . .