Just remove the filter periodically

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GPR Exhaust - SatInox Slip-On for Yamaha WR 400 F - 1998 to 2000 Muffler with:dB Killer-Link Pipe Just remove the filter periodicallyGPR's Satinox silencer is made of 304 stainless steel. It has an oval shape with a diameter of 90mm. Product Features SOUND: Upgraded sound from stock exhaust. Although louder than stock but in compliance with the limits prescribed by law, this exhaust produces the softest sound of all the GPR exhausts. PERFORMANCE: Upgraded performance from stock exhaust QUALITY: Italian made with high grade welding WEIGHT: Lighter than stock exhaust Technical