Paul,

I hope you don't think I'm nuts, but what would you think of essentially
using your muffler as a manifold for mounting a turbocharger?  The
turbocharger would be used mostly for normalizing  for altitude and the
reduced heat and energy out of the muffler would prolong the life of the
turbocharger.  The muffler must also be fairly stout to survive being
mounted directly to the exhaust ports it should minimize the weight for the
whole installation.  I think it would also be more compact than using a
manifold and turbocharger with a muffler downstream.

Steve Brazil

It will work. What you wind up with is a slightly less efficient
aerodynamic systems so you lose a bit of velocity on the turbine.
The same goes for the intake side. If you want the best BSFC
on a turbo engine use p-ports.

Paul Lamar