I have never driven a roadster with a stock manifold. The race car has a
header and open exhaust. Its so loud it hurts my ears when I am next to a
wall on the outlet side.
I have had experience with other 4 cylinder cars and for them there isn't
any real difference in the noise level between headers and the stock
manifolds.
I stand corrected.
Dick Ryan ex. 24022
(650)312-4022
Risk Management Dept.
SM 2000/2
FAX (650)312-5830
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.
>
>"Ryan, Richard" wrote:
>
>> I don't think the sound level is determined by the header or stock
exhaust
>> manifold. The sound level is determined by the downstream things
>> (resonator, muffler, glaspak, etc.).
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