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The stock iron headers on the 1st gen 3SGE motor, are pretty good, with the downpipe they are a 4-2-1 design, so it is questionable if an aftermarket header would add much power. Since i have never tried i don't know. Most aftermarket headers are 4-1 design, which may give better top end power, i do know that a 5SFE header will bolt to the head, then you would custom fabricate to the downpipe, hotshot.com makes 5SFE header for 90-93 celica, mr2, I would be curious on how much power it would make, but it is around $400.
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