Nick had some approved arrestor end caps made for the Krieger muffler. It might be worth contacting him to see if he has any left. I liked the quietness from it as you could sneak up on anyone with it but the performance suffers. I added about 10 to the fuel load adjustment when modded I think.
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06 Gas Gas FSE 450 USA
07 Gas Gas FSR 450 UK with motard and dirt wheels
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