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Originally Posted by Xdragonxb0i
I made post about tge p&l header being loud, i contract my statements, it louder then stock for sure but pretty tame when DD. At 75mph , the noise start to bother me.
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Have you just swapped the header and left the entire rest of the exhaust stock (and still noticed a significant noise increase)?
And are these 'P&L header dynos' also referring to just the header-swap with a stock exhaust?
Back to topic: If one wanted a header which increased power equally over the entire rpm range, it would need to have variable length runners like a trombone.
(For a similar reason Mazda had 'variable-length-intake-runners' on its 26B race car engine to improve fill factor over a wide rpm range. See picture below.)
