Manifolds , headers performance wise don't overcome manifolds until your over 5,000 rpm. They leak ,They're expensive and on a regular daily driver/ cruiser no real benefit over regular rams horn manifolds ,Here's a 350 I'm assembling using some chrome rams horn manifolds (this truck will be sold when I'm done ) they look good , they work and your not dealing with header problems down the road
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$127.99 shipped from Jegs regular cast are about the same price