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I would say keep the headers.
My engineer friend put a set of pacesetters on his 4cylinder 2000 tacoma and picked up a little under 1mpg.
It was a very economical thing to do. He had a cracked manifold and couldn't get his truck to pass inspection. He could not find a used one that wasn't cracked. The dealer wanted $440 for a new one. Pacesetter sells a bolt in header for his truck and its under $200. Also if they crack, you can repair them very easy.
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