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  ATV Projects
FMF Q ATV Muffler Sounds Good and Adds POWER
Who says you can’t make power without adding noise? Donnie Emler of FMF Racing says they can. FMF Racing “who has been designing exhaust systems since 1973” says they found the answer in there FMF Q ATV muffler.

With the new 96DB sound level laws coming into affect, more and more riders seem to be asking for a performance exhausts, but do not want the loud noisy pipes. So, we decide to put this FMF Q to the test!

First off - To R&R the slip on exhaust is easy. You undo the clamp that holds the stock muffler to head pipe and remove 8mm bolt that holds stock muffler to frame. You then take the Q and slide it over the stock head pipe.

FMF uses a unique mounting system with a silicone a rubber vibration sleeve, and according to Emler of FMF, they cost a little more but do wonders for vibration. The clamp wraps around the muffler and fastens to sub frame. It is that simple.

As you can see the Q is a lot more compact which will give you more clearance on your suspension. Another benefit is that the FMF Q is lighter then the Stock muffler (Stock weight 8.3lbs and Q 4.6lbs). While the FMF Q does not required jetting changes but, according to George Luttig Director of R&D FMF Racing you will gain more performance if you use the FMF Power Jet Kit. So we took FMF’s advice and installed there Jet kit. This will take about 45min to install. You will have to remove the tank and fenders to get to the carb. The kit comes with a # of jets and a different needle for different applications such as altitudes. It has directions for a stage 1 or stage 2 set up. We went with the Stage 2 which is used if you are running a FMF Exhaust with the air box lid removed set up for elevation of 3000ft or below.

Before we put the Q on the TRX450r We tested the stock muffler and on the DB meter it read 88db, very quite. So how did the FMF Q do? The FMF Q pass the sound test with excellence @ 91db! Do not be fooled it has a decent grahl when you rap the throttle. With   rangers testing DB sound on quads you better be under 96DB or you can count on a nice hefty fine. Dont worry, the Q will get you way under the new DB Law.

Now for the real tests, we dyno the TRX 450R (note we used a MC DynoJet Dyno) and it makes better power through out the power ban as you can see.

On the trails, the TRX450R ATV Quickly revs out of the hole with good acceleration. You can feel the increased power.


Wheeling the TRX450 becomes easier and you can tell the quickness the pipe gives. Burning up the local trails becomes quite fun. You can climb monster hills, race your buds through tight trails or wheelie through your creeks. This system would be good on the MX track as well. All in all the FMF Q is a good performance exhaust with increased power and minimal noise!

For more info contact

FMF Racing
18033 South Santa Ana Ave
Rancho Dominguez, CA 90221

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Composed: 04/30/2004 | Modified: 09/20/2004
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