Hornet is going the Inconel route to cut weight.
They don't seem to be all that cost conscious as they sell
the airplane for $80,000. You ought to offer Inconel as an option.

Paul

   Some good news.  I took my little tangential exhaust system to
RotaMax and it did a very good job of softening the exhaust pulse and
cutting down on the noise.  The single was run up to 6000 rpm by their
estimate.  No tach on the test engine.  It was on a stand not the dyno.

  We attached a FlowMaster directly to the tangential outlet and the
exhaust was remarkably quiet.

The design that we are leaning toward is a cool tube tangential which
feeds directly into an all stainless steel muffler such as a MagnaFlow
#14415 (summit racing).  This is a very light weight system that will
fit inside any cowl and should work with Mazda conversions too.

I think that with the exhaust pulse and  heat both reduced in the
tangential that a SS muffler down stream will do O.K.

Jerry