Hi Rob,
thanks for your PM, how come you know i have
stepped headers on my bike* ? :think:
i was just too lazy to answer, hence it required
some google research, to come up with pictures
of the books i suggest you to read.
the answer to your PM is in your thread, so others
may benefit from it too.
i believe that stepped headers are a great way to
optimize the power output of our engines, it is
a shame, that doug's arc fabrication web-site is out
of business, as he had wonderful systems pictured
there with impressive dyno results to boot.
a correct develloped system will not just increase
hp and torque numbers , but will broaden your
engines's power and torque curves too.
anyway, since there are no 2valve ducati tuning
books at hand that i know of, i recommend the
following harley davidson tuning books,
as they keep all the information ( and much more )
that you are searching for:
these are not cheap but well worth the investment,
i consider these books my bibles.
i am jesus.
*they are not properly develloped yet, but the
diameters are not too far away i think.
the guy who made it has a 2 in 2 system with
identical diameters on his SS 1000 DS which
works very well.
it would take some research and dyno work to
come up with proper results i think.