Bob,
Since you don't race the car at high RPMs constantly on a road course you're
better off with 2" pipes as it gives more torque than the 2.25" pipes. The
same is true for headers with large diameter tubing. Too much of a good
thing is sometimes not the best.
Mike
----- Original Message -----
From: "R Haug" <haugchiro@moscow.com>
To: <datsun-roadsters@autox.team.net>
Sent: Wednesday, January 17, 2001 10:35 PM
Subject: Re: Header Discussion
> bob_wilson@agilent.com wrote:
>
> > For what it is worth, I used 2" dia stainless steel tubing for my whole
> > exhaust system. I did the "flattenning thing" to fit it through the x
> > frame. I don't remember the exact value, but by flattenning the 2" pipe
to
> > about 1.5" width (so will fit without banging into the x frame)
>
> I took my frame to a fabrication shop, had them cut out the exhaust holes
in
> the x-frame and weld in 3 inch tubing so I could run 2 1/4 in diameter
tubing
> for the exhaust. CDM only has a 2 inch flex piece so the exhaust doesn't
> rattle in the frame. Since there is not a 2 1/4 inch flex piece I will
> probably just go with 2 inch pipe from the header back. Would anybody be
able
> to tell me if there would be any performance gain from 2 inch to 2 1/4
inch
> exhaust. Street driven mostly, some autocross. Or at least it will be
when I
> get the car back together. 2L, ported head, solex B cam, solex carbs, 5
speed
> Bob
> 67.5
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