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I disagree. While minimal, a header will give you power a bump in output. Dynos aren't influenced by magazine articles, friends, or the Placebo affect, and dynos say headers increase output. Stock exhaust manifolds are great, but there's no way they flow as well as a performance header.
Once again- gains are minimal, and nothing you would ever "feel." I don't think anyone here is delusional enough to think that by adding I/H/E they'll be able to outrun anything they couldn't outrun before- besides their own car- stock.
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