I had both headers on my car. (Mac 1 5/8 equal & unequal length). I felt a huge difference between the two. The equal's gave me more bottom-end and about 2 tenthes in the quarter mile on average. Headers were my first mods I did on my car back in '93. So we are talking about a stock engine with just shortie headers and a off-road H pipe with Flow-masters.
But what do I know?
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