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I already have got an FMF Powercore 4 on my 400ex. This summer im putting on a Powerbomb header on and a UNI air filter, will i need to make up for the air flow by jetting the carb in the winter??? I live at about 400 feet above sea level
 

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Depends how cold you get. The 400EX likes to have the pilot jet dropped 1 size for cold weather starts. But air gets denser as it gets colder. So yes you might need to rejet for cold weather
 

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You might need to raise your needle a notch.to compensate for the extra air that you will be getting.
 
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