If your in South Texas you need to get with Patrick G on Ls1tech he has the 00-06 trucks down and now he is doing some really coll stuff with the 07-10. Especially the 6.2L with VVT or the 6.0 with DOD.
Thanks Vic.
They are UPD lids (Ultimate Performance and Design) They are a patented air lid for the Chevy trucks.
http://www.ls1tech.com/forums/lsx-parts-sale/1045414-fs-99-08-chevy-truck-4-8-5-3-6-0-upd-cai.html
$200 shipped with AFe filter / $180 without filter
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