The center-center dimension between the Renesis end ports is 10.5" so if
your main canister is limited to 8.5" long you have some creative piping
to consider.  Perhaps centering the main canister to the center port
with the end ports coming in at an angle yet still tangential is an
option.  Paul included a 3D layout earlier in the discussion where the
front end port elbowed into the end of the collector canister.  That may
be an option for you too.  Perhaps Paul can provide further guidance on
this as I am new to the tangential design.  I find it intriguing and
possibly having potential for some non-aviation uses.

Some of the systems I've described are really more of a tangential
header manifold than a muffler.  I'm contemplating designs for a Mazda
RX-8 race system which will include piping toward the rear of the car
fitted with several stainless scrubble-packed lightweight racing
mufflers available from Burns Stainless etc..  The car will still be
quite loud even with these, though not nearly as much as most aviation
applications.  In a few event locations there are specific sound
controls that must be adhered to so any additional damping that can be
provided at the exhaust manifold is welcomed, but not paramount for my
intended application.

Mark Sipe

Those Burns Stainless mufflers are just what we are looking for.
a 2 1/2" inlet is  3 1/2" in diameter and 17.1 inches long and weighs just
2.7 pounds. Cost $216.75. What a bargain. I don't know the SS
alloy but it could be 321. I'll bet they will make them
in Inconel if you ask as they are now selling Inconel
tubing.

www.burnsstainless.com

Paul Lamar ...No rotor no motor.

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