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headers are so much better in every aspect. HOWEVER the quality of the header is the problem. The flanges need to be thick,of good quality steel/iron. The welding of the tubes to the flanges needs to not intrude into the gasket sealing surface- a big problem. If headers were made by the person using them they would be the cat's ass. However they're made by robots or worse. Quality control is a joke-ie made in china. Then there is the longevity concern. Manifolds last forever. headers last for 5 years,maybe 10 if car stored inside.Modified engine = headers. Stock engine or 1 with some improvements=manifolds. Manifolds with 2 1/2 exhaust with good mufflers flow just fine for many applications. Hope this helps.
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