http://www.wrrdualsport.com/tech-guide/air-intake
I fear the translation might be a problem, but please read the link above if you can.
The AIS does not strengthen bike.
If you have the stock exhaust on the bike you should keep the AIS system.
Is your bike 100% stock?
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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