CONTACT: www.fmf.com ;
FMF 4.1 RCT YZ450F EXHAUST
PRODUCT: The FMF Factory 4.1 RCT complete exhaust
system for the 2014 Yamaha YZ450F features a titanium
MegaBomb head and mid-pipe, an anodized-blue tail section, and a carbon fiber end cap. The Factory 4.1 also
includes a spark arrestor and 94 dB sound insert.
POSITIVE: FMF’s 4.1 titanium complete system saves 2
pounds compared to the stock unit. Stock, the YZ450F has
a sort of jumpiness right off idle that makes it difficult for
some riders to corner with the throttle. The FMF system
mellows and smooths this power delivery. The midrange
power comes on sooner and pulls stronger than stock. Top-end power is increased slightly. FMF’s system allows the
use of Yamaha’s stock heat-shield protectors. For individuals under strict sound regulations, using the 94 dB insert will
cost minimal top-end power and add a bit of bottom.
NEGATIVE: The cool look of the MegaBomb header is
hidden from view at the front (or maybe it’s the back) of the
engine by the radiators. Once the 94 dB insert gets hot, it is
almost impossible to remove. Cool-down time is a must.
BOTTOM LINE: FMF’s Factory 4.1 RCT complete
exhaust system for the 2014 Yamaha YZ450F offers
spark-arrestor capabilities, 94 dB sound compliance,
weight savings, usage of the OEM heat shield and
power gains. That all sounds good to us. Where do we
sign up? ;