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You'll need a lot more info than just displacement to make an educated guess. Cam duration? Cylinder head flow? How long are the intake tracts? What RPM range? Stepped headers? If so, how many and how long? That's just a start.
Most quality racing headers will be 321 stainless. If you want them thinner, lighter and more durable you can $tep up to Inconel 625. Merge collectors work best.
Didn't you ask this same question a few years ago?
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