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Does fit a 2000 5.3. I'm trying to upgrade intakes
Like already mentioned, this intake would not fit your 5.3L. You need a cathedral port intake, commonly referred to as a TBSS or NNBS intake. I sell those as well, but am out at the moment. I should have more coming in towards the end of the week, I can let you know.
On another note to others, this intake has been sold and is no longer available.