FMF Q4 Muffler Alu KLX400SR 03-04 DRZ400 06-07 DRZ400S 00-14 DRZ400SM 05-14 INCORPORATES INTERNAL BAFFLES, CHAMBERS AND SPACE AGE SOUND-ABSORBING MATERIALS TO ACCELERATE EXHAUST FLOW WITH LESS NOISE AND MINIMAL POWER LOSS WELL UNDER THE 96DB SOUND OUTPUT ON MOST MACHINES TO SATISFY STRICT SOUND REQUIREMENTS U.S. FORESTRY APPROVED SPARK ARRESTOR WITH MAINTENANCE FREE, STAINLESS STEEL SPARK ARRESTOR SCREEN Q4 HEX EXHAUST IS ONLY AVAILABLE FOR &quot;CURRENT MODELS&quot; LISTED