On my c/f bonnet, not the Seibon bonnet, I had to remove the covering on one side of the vents from the underside of the bonnet as it was fouling on my cold air box. I have tweaked the brackets slightly for the airbox and piping and now it sits fine. However, by the looks of things my vents don't go back as far as they do on the Seibon bonnet.
Not sure if this is any help but it's all I can offer!
My bonnet