The answer to this question depends on a variety of circumstances:
1. What size is the engine? Larger engines benefit more greatly from increased exhaust flow in most cases.
2. What size headers are you thinking of using? Choosing a primary diameter that is too large or too small may reduce your total power.
3. Headers alone may not have much effect on power if the engine already has a decent set of exhaust manifolds and/or has a restricted intake system.
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