WHAT IS IT? The Factory 4.1 is FMF’s premium race
exhaust system for the new 2014 Husqvarna FC450. It
is the choice of several Husqvarna support and offroad
WHAT’S IT COST? $949.99 (Ti/Ti/carbon end cap),
$899.99 (Ti/Ti/Ti end cap), $824.98 (stainless/aluminum/
carbon end cap).
www.fmfracing.com or (310) 631-4363.
WHAT STANDS OUT? Here’s a list of things that
stand out with FMF’s Husqvarna FC450 Factory 4.1
(1) Analysis. You don’t have to be a Wharton School
of Business graduate to realize that the Husky FC450 is
really the KTM 450SXF in white clothing. Thus, you can
extrapolate that FMF’s Factory 4.1 exhaust system for
the Husky is really the KTM system—minus the
wardrobe change. And that is true. But what isn’t true
is that the KTM 450SXF and Husky FC450 come with
the same exhaust pipe. They don’t. While all of the 2014
KTM four-stokes use the open-flow 2013 KTM 250SXF
mufflers, the 2014 Husqvarna uses the 2013 KTM 350SXF
muffler. So what? The 2014 350SXF muffler has two
perf-core cones inside the 42mm muffler core (one facing
forward and one facing backwards). These cones restrict
exhaust flow, lessen the exhaust note and dampen
throttle response. So while the FMF Factory 4.1 Husky
exhaust is the same pipe as the KTM pipe, it makes a
bigger difference on the muffled-up Husky.
( 2) Performance. In stock trim, the 2014 Husqvarna
FC450 has a luscious powerband. It is broad, easy to
ride and capable of putting out close to 57 horsepower.
But, and there is always a but, its power starts out very
mellow and builds incrementally as the rpm increase.
In back-to-back tests against a KTM 450SXF, every test
rider felt that the FC450 felt hollow down low—a
problem that we attributed to the no-flow offroad airbox
design and the two ice-cream-cone restrictors in the
muffler. Every MXA test rider wanted the FC450 to hit
harder down low, exhibit better throttle response and
rev faster into the midrange. Enter the FMF Factory 4.1.
It turned our Husky FC450 around and headed it in
the right direction—although we did help by drilling
quarter-sized holes in the airbox cover to get the
engine to breathe.
( 3) Fit. The three-piece FMF Factory 4.1 system
slipped right into place, but the fit was tight between
the frame and the shock reservoir. Surprisingly, FMF’s
KTM 450SXF pipe will not fit on the Husky FC450
because of a clearance issue with the plastic subframe.
( 4) Choices. FMF offers this pipe in titanium with
a carbon end cap, blue-anodized titanium and stainless
steel with an aluminum canister and carbon end cap.
WHAT’S THE SQUAWK? No complaints.
If the KTM 450SXF and the Husky FC450 were
identical, the FMF exhaust would be an
excellent choice; however, they aren’t the
same. The Husky’s stock pipe is detuned, which
means the Factory 4.1 is an even better
choice for the Husky than for the KTM.
FMF FACTORY 4.1 HUSQVARNA FC450 EXHAUST
MXA TEAM TESTED