Don't go with anything that just sits under the hood. A guy I knows has some old intakes not made anymore. he picked up 15hp from it. No tuning. He works with Patrick G and they own a shop together in TX.. They know there shit. I can get you info to order one if you want.
here:
99-08 Chevy/GMC 4.8, 5.3, 6.0 Truck/Tahoe/Suburban CAI and filter (
$225)
(Black/Clear/Carbon Fiber/Chrome)
I did back to back dyno test on the my Tahoe with the stock air box and the 5.3L CAI and picked up 15rwhp/14tq.
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Here are the color choices
If you are a member of LS1tech.com his name is 98aggie.. pm him and he will get you hooked up. he is a moderator over there and puts out many 500+ hp ls1s