Hey guys so I got a G35 last year.. and I've broken it in many ways.. however I don't know what this sound might be. As far as I know the guy before me put an aftermarket Stillen exhaust system as well as the Stillen z tube intake. Any way you guys can help me figure out what might be that buzzing/humming noise?

You guys can hear it here:

 

Couldn't hear anything, only when you accelerate? I'd take it to an exhaust shop or just a decent Mechanic.