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The Q-Stealth is living proof FMF is the only exhaust company committed to bringing new technology to the 2-stroke enthusiast
If you’re running out of power up top
FMF is the leader in high performance quiet technology and our Q4 HEX is the next evolution in off road exhaust
Meet the WORLDS bestselling spark arrested exhaust
-Race-tested
Q4 041287 KTM-300 XC-W-2009 The Q-Stealth is living proofFMF is the leader in high performance quiet technology and our Q4 is the next evolution in off road exhaust. The Q4 employs intricate chambers, baffles and proprietary multistage packing material making it the best performing quiet muffler available. With the Q4 you dont need to hear the power, just feel the power! Developed over years of championship off road racing Max Sound output 96dB; most models below 93dB Constructed from aircraft grade
