I've long been skeptical of CAIs and what sound/performance benefits they give, if any. I'm uninterested in bling, I'm going for pure performance-related gains.
I like a deeper intake sound and some street-RPM power gains would be very welcome. What have all your experiences been like on the 6.2?
No bling? Then, for performance, you'd be all set with a substantial seal between the filter box and fender and maybe a good filter. But, there's really nothing to be improved beyond that. The foam seal is the factory setup's only real fault. It's thin and deteriorates with age then falls in and allows some of the hot engine air to be inhaled. I replaced mine with some Frost King 2.25" square weather seal- about $8 at Lowe's. My IATs in start-stop traffic are 1-5° above ambient at most. Of course, they rise when idling for a long time, but that's to be expected. Even then, it's not a whole lot. They quickly drop once driving again. Cruising on the highway, the IATs will match ambient. You can't get any "cooler" air than that, and it's under $10.
For sound, anything that loses those muffler chambers (Helmholtz resonators, if you wanna be a nerd about it) will increase the intake sound. I'm a fan of the Airaid MIT. It's simple, relatively cheap, easy to install and looks good. The intake sounded so good on mine that I bumped a louder muffler further down my list of mods. If you're crafty and on a budget, you can make a considerably good-looking intake tube with PVC or ABS pipe and appropriate rubber couplings from the plumbing section. Some nifty gluing, sanding and painting and only you would ever know what it actually is.