spark arrestor

Anyone have info on a spark arrestor that can be used on a YZ426? If a WR400 silencer is used how much will it hurt th YZ's performance? The reason I'm asking is to ride on a national park trail that is a 15 mile run of varied terrain that has a spark arrestor mandate.

White Brothers makes a s/a silencer that will fit the 426. E I think that since it is more restrictive, you will notice better response down low as long as you dial in your pilot circuit. That would be a plus for woods riding where you spend a lot of time in the low RPM range.

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