The Factory 4.1 system is FMF Racing's premier performance exhaust system. With 30 years of racing experience behind it, the Factory 4.1 takes advantage of everything we've learned on the race track.
FMF model # 042211
Fitment: 2009-2011 Kawasaki KX450F
*Note: Actual product may slightly vary depending on make and model.
Item Details
Type: Slip-On
Configuration: Single
Const: Carbon
Finish: Carbon
Midpipe: Titanium
Endcap: Titanium
Spark Arrestor: Insert (sold separately)
Quiet Insert: 94dB Insert (included)
Used by professional race teams such as Factory KTM, Yamaha of Troy and Star Racing
Horsepower gains throughout RPM range
Size chart
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