Would it be worth the effort of polishing/honing the inside of the stock
mainfold? To make the path smoother. Also, how much would it cost to "Hot
Coat" the header or manifold?
>
>Sorry, but headers are almost always significantly louder than cast exhaust
>manifolds. The thinner wall of the header allows a lot more of the noise
>of exhaust blasts (at the head, where the forces are most pointed and
>loudest) to transmit--regardless of exhaust pipe, muffler, etc.
>
>Headers are louder than stock manifolds.
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