I wouldn't bend it the same way the Injen is bent for the 2.0, first of all. More bends make more resistance, and the air has to travel further to get to the intake plenum. I'd either do a completely custom job (like a thread about some guy's custom one in this forum), or make one following the setup of stock. As long as you use piping (I'd definitely go metal, PVC has heating issues), it will get the air through easier, and will take in less heat. You can just throw out the air can, that's what I did, and the 3 clamps hold down on the filter itself just fine, without any gaps or anything. And no, the wires don't need to be altered at all with the Injen for the 4g63, as long as you face the MAS connector toward the battery/firewall, the wires will be fine.
Here's what you'll need to do this:
1. Some metal pipe, bent to fit of course
2. Rubber collars to connect the pipe to the TB and to the MAS (make sure you get the right diameter)
3. Clamps to keep collars connected to pipe
4. Breather filter for the engine (see where the vacuum line goes into the pipe, the little red tube coming out the side?) Since you won't have to put a "nipple" in the pipe, just get a breather filter for the engine...these are generally around 10 dollars where I've seen them.
5. Supports - supports are always good, unless you want your filter sitting down against stuff that can damage it. Just make something that can connect to a piece of frame or some other piece of solid metal under the hood (the Injen comes with 2 little brackets that go from the clamps on the filter collar to little metal supports that you just bolt on to a piece of metal, located somewhere in front of the battery)
6. Some patience, a little time, and a nice cold beer are always good with these things too
Eureka!! You've got yourself an intake!
...a big green intake with wings that's going to eat poor Gandolf!! Oh NOOOO!!!