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once, basically you set it up so that as a pulse is leaving the mfld and
creating a low pressure zone behind it, this helps draw out the exhaust
from the next cylinder as its valve opens.  This can only really be
optimised for one rpm or narrow rpm range though.  And obviously it gets
weird with 5 cylinders.

> anyway, im contemplating making, or having made, a tubular manifold and
> downpipe assembly and i really need some guidance, has any one got a custom
> one made??? what does it look like, and is there any "magic" dimensions to
> it or can it be made from good rule of thumb from a book like this. i know
> the N/A quattro (or should that be Quattro) manifold and downpipe is 5-3-1
> but i want to have a go, or at least do the math for this.

The 5 cylinder 4000 Q (84-87) has a very nice 5-3-1 setup, it should be
all you need to start building a nice shiny custom exhaust system.  It
gets a bit narrower near the end of the DP, this may be useful or maybe
it should be cut off...

There is a big fancy set of headers floating aorund out there , Mike
Tipton used to own them, Now I think Carter Johnson does.  At least one
of those guys put some photos of them on a web site once.

-- 
Huw Powell

http://www.humanspeakers.com/audi/

http://www.humanthoughts.org/