I read that a ’99-02 KX FMF Q silencer would fit the GasGas, so I bought one off ebay.
The Q silencer is about as long as the stock GasGas Euro silencer and a few inches longer than the GasGas FMF TC2 silencer.
Fitting the silencer on my ’06 EC300 required the following…
> Trim ~0.2 inches off the end of the stock GasGas pipe.
> Trim ~0.4 inches off the silencer tube where it slides over the pipe.
> Slight trim of the rubber sleeve that fits over the pipe joint.
> Bend the silencer body up a few degrees relative to the silencer pipe to get the mounts to align.
> Bolt into place.
The FMF Q tucks in well and provides adequate tire clearance. It fits pretty well except that the highest point on the silencer just touches the rear fender.
From the riders perspective, I can’t hear a difference in noise level between the FMF Q, the FMF TC2 and the stock GG Euro silencer with the rest of the engine noise.
As a note, the KX FMF Q would not fit on my ’01 XC300 as it had too much interference with the rear fender.