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Are you asking about air intakes? If so this thread, http://www.tahoeyukonforum.com/forum/showthread.php?p=489452#post489452, should give you some research material to decide which is best for you.
Test vehicle was octane limited, knocking slightly with all intakes at various points. Testing with better fuel may yield different results
I just put an MIT with K&N filter in my Denali last night. It feels like it goes when I tell it to just a bit quicker, and the sound is great.