did you tighten down the coupler an clamp on your inlet then try putting the intake on youre vibra mount? try loosening up your hardware then moving it around a bit.
i have an injen an apposed to being on top like yours i had to switch it an mount it underneath actually.
try mounting it with your stuff loose so it can move around a bit, if anything could be just a bad intake. and yes, its better to remove your bumper, its easy just some small bolts an pressure clips. easy stuff.
the hard part is not losing any of the little guys HAH!