WHAT IS IT? The Factory 4.1 exhaust with MegaBomb
head pipe is FMF’s premium exhaust system for the
2014–2015 Husqvarna FC250.
WHAT’S IT COST? $899.99 (titanium/carbon fiber end
cap), $849.99 (titanium/titanium end cap), $699.99
CONTACT? www.fmfracing.com or (310) 631-4363.
WHAT STANDS OUT? Here’s a list of things that stand
out with FMF’s Husqvarna FC250 Factory 4.1 exhaust.
(1) Models. FMF makes three versions of the Factory
4.1 for the 2014–2015 Husqvarna FC250. MXA tested
the RCT, titanium, anodized, full system with the carbon
fiber end cap. It is made from titanium, the canister is
anodized blue, the end cap is carbon fiber, and the head
pipe offers MegaBomb’s Resonance Chamber Technology
(RCT). For $50 less, you can order the Factory 4.1 with a
Ti end cap and the option of anodized blue or natural Ti
canisters. If you don’t mind the extra weight, FMF also
makes a stainless steel header with aluminum muffler for
( 2) RCT. FMF’s Resonance Chamber Technology
(RCT) consists of the MegaBomb resonance chamber in
the head pipe mated to a specially shaped muffler core.
Resonance chambers not only help lower sound levels by
approximately 1 dB, they also allow for a shorter overall
tuned length of the system, which means greater centralization of mass and a reduced risk of crash damage.
( 3) Performance. In stock trim, Husqvarna’s FC250
has a powerband that starts off mellow and then steadily
ramps up until it revs to the moon. The FC250’s power-
band is unlike all the other 250 four-stroke powerbands.
It offers class-leading horsepower, but it is the most
difficult power to use. It is linear, slow-revving and
doesn’t make max power until the very top. When we
bolted on the FMF Factory 4.1 system, our testers were
grinning from ear to ear. It improved the powerband
from the bottom to the top. Test riders were able to use
the clutch less thanks to new-found power in the mid-
range. It kept on gaining power on top and did not lose
an ounce of over-rev when the engine was wound out.
Every one of our testers loved FMF’s FC250 exhaust. We
were surprised by the power gains throughout the entire
( 4) Fit. The three-piece FMF Factory 4.1 system
slipped right in place. The fit was tight, but thanks to
FMF’s separate mid-pipe, there were no issues.
( 5) Sound. With increased packing volume in the
irregular-pentagon-shaped canister, plus quiet inserts and
a removable spark-arrestor screen, the FMF Factory 4.1
can pass all the current sound tests. The MXA wrecking
crew, however, preferred to run the FMF system without
the quiet insert to make the most gains.
WHAT’S THE SQUAWK? The RCT chamber bulged
out enough to melt the test rider’s boots.
Either this is a great pipe or a bike in desperate
need of help. We think it’s a little of both. We’d
run it in an instant.
FMF FACTORY 4.1 HUSQVARNA FC250 EXHAUST
MXA TEAM TESTED