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Sigh.
I'm NOT saying anything about a tune not being worth it.
I said two things
1. Most of the gains I have seen that can be attributed to an exhaust component are from the header.
2. Header back systems that show a gain, that have had a tune; you cannot put that gain down to the headerback, unless you have performed the tune before and after the headerback was installed.
Saying that x car gained 31whp from a headerback only, intake, and tune, and implying that the headerback is therefore good, is misguided. You might have gained 30whp with just the intake and tune.
If the stock headerback was indeed so bad, you'd see immediate gains by replacing them, even untuned, the fact is you don't.
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