I like the idea of having something with an airbox thats fed external air to protect the filter or a short ram with a good heat shield and fed external air, even though it's in the engine bay its safer from the elements and on a daily driven car I'd rather the bit of safety and reliability over lower intake temps. I was going to go with a cold air intake but just don't like the idea of my filter in the wheel well basically, especially since I've ripped out a few wheel liners before and would be bad if I got stuck a distance from home, in the rain. I'd go with something like the COBB or K&N like you said if you're set on going aftermarket but like Grant said It's not going to help with performance a whole lot. Put a lightweight crank pulley on if you haven't already, it will be cheaper and you'll notice the benefits more, especially on a N/A motor I'd imagine.