I think you could combine the WRX scoop with something like the ebay dual intakes. It would take some work, but you could fab up something to seal the intakes up against the hood. If you can keep the water out of it you should see a very noticeable difference. The 3.7 likes having huge amounts of cool air dumped into the motor. Just make sure and get the torque management removed from your PCM if you really want to feel the difference.
Here's one of the dual intakes.
Here's my hood. It's rather aggressive from the front.
It's bolt on and functional. It dumps all the air from the scoop right on top of a cone filter of the K&N, AEM, etc.
It's a little more stealthy from the side. Fun to have a sleeper.
