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.
At 01:32 PM 1/8/01 -0800, Gary McCormick wrote:
>That would be my thought, so Calspeed must have made other mods in addition
>to the header.
>
>Gary
>
>"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.).
>>
>> Dick Ryan ex. 24022
>> (650)312-4022
>> Risk Management Dept.
>> SM 2000/2
>> FAX (650)312-5830
>>
>> -----Original Message-----
>> From: Gary McCormick [mailto:svgkm@halley.ca.essd.northgrum.com]
>> Sent: Monday, January 08, 2001 11:56 AM
>> To: CalSpeed@aol.com
>> Cc: Robert.Long@CSDInc.com; datsun-roadsters@autox.team.net
>> Subject: Re: Should I add a Header?
>>
>> All other things being equal, what difference would a header make in the
>> sound level vs. a
>> stock manifold?
>>
>> Gary McCormick
>> San Jose, CA
>>
>> CalSpeed@aol.com wrote:
>>
>> > In a message dated 1/8/01 6:16:50 PM !!!First Boot!!!,
>> Robert.Long@CSDInc.com
>> > writes:
>> >
>> > << What are people's thoughts on replacing the stock manifold with a
>> header?
>> > >>
>> >
>> > On my U20 Solex it is wonderful! Quite loud but well worth the swap for
>> > power.
>> >
>> > Calspeed
>> > <A HREF="http://members.aol.com/calspeed1/motorsports.html";>Calspeed
>> Datsun
>> > Motorsports</A>
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