There should be a hole in the intake tube for the wires to go into. I think it's the MAF sensor. Even my cheap ebay intake had one. If there's no hole, you will have to make one, but get better info first. I, admittedly, don't really know all that much.
As far as the install, it's pretty straightforward. Unscrew the clamps for the couplers, take the old box out, put the new tube in, re-attach the couplers, enjoy. I had to make a brace for mine, because the filter was rubbing on the bottom and developed a hole. It's not that hard, if I can do it, anybody can.