Toyota and others simply weld the flange down lower on the pipes a bit,
allowing them to stick up into the iron upper manifold a little. In the
case of a Spitfire, you'd have to weld a little stub pipe onto the lower
manifold to duplicate the effect. Not quite as good as making a new one
complete, but it should be fine.
As long as you don't go wild with the new tube section, it's not going
to hurt flow appreciably. You could even use a smaller pipe section
that slipped into the existing pipe without doing much of anything to
the flow. The muffler is far more restrictive.
Only if you go wild with small diameter pipe sections or sticking it
way up into the upper iron manifold would you adversely affect flow.
All you're after is blocking the exhaust gasses from going by the
gasket, nothing more.
>>> Michael Hargreave Mawson <OC@46thFoot.com> 4/5/2005
I guess that answers my question about whether tubular inserts would
cause a problem with the flow of exhaust gases. If Toyota and Fiat
both design them in, there can't be any real reason for concern.
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