Will not damage motor. It's just a spark arrestor. Keeps you from setting forest/field on fire.
No advantage.
Bike will run louder without it. That's a disadvantage.
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2008 WR250X
Gearing: 13t - 48t
Power Commander 5 / PC-V
Airbox Door Removed - Flapper glued - AIS removed
FmF Q4
Bridgestone Battlax BT-003rs