Do u like the sound of a rabid squirrel with tourettes swinging a hammer around inside your glove box? If so, get the AFE stage2 si. U may gain a few ponies at the cost of sanity. If your supercharged, it's a great intake and not loud in that case... But if your not supercharged, I wouldn't get the AFE.
If u like swapping parts onto intakes when it rains, and want to cut some sheet metal, get the urd intake.