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As far as quality relating to longevity, at this point you can only speculate. There are people who bought cheaper headers made with the same materials as the more expensive headers. And they have lasted just as long. Some have lasted over 20,000 miles and 2 years so far. So nobody can really say that spending more money for a specific brand will give you better quality as far as longevity for now. Maybe after several more years.
However there are several differences in the overall finish between cheaper and more expensive brands. Although none of this has been proven to equate to better performance, the more expensive brands do have a better and cleaner look cosmetically...despite the fact that once the headers are installed you really can't see those differences.
In any case, there is no "best" because each person is looking for different things. If you care about cosmetics and where a header is said to be made, then you might want a specific brand. If you don't care about those things and just want a set of headers, then you might want a different brand. This had been debated on here many times. And it always comes down to preference...just like with cold air intakes and exhausts.
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