You should *probably* be ok. But 11.1v is alot of power. You could always test it out. Get ahold of a 11.1v lipo, shoot it in full auto, and if the sound really sounds stressed, don't do it. If it sounds perfectly fine, shoot it for a while, and then open up your gearbox and check it out. If anything breaks it will probably be your piston ($25 fix), so if stripping that is worth it to you, go for it.
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