I am in the process of designing and building
a 321 SS tang muffler for my P-port RX8 engine.
I am using a $55  Mazdatrix RX8 flange.

Does anybody else want one as I am having  the
SS water jet cut? It will look something
like this. If  I don't hear from anybody
I am only going to make one and the  price
will go up if you want one later.

If it turns  out to be not quiet enough you should
be able to use a second Flow  Master muffler under the
airplane to quiet it further. By that time  the
energy in the exhaust should be far enough down
so the  stock automotive muffler should live.
The RX8 engine is easier on  mufflers to begin with.

I am not guaranteeing anything as the  Wankel
always surprises :)

Paul  Lamar

Paul, am I missing something here???

You stated that this muffler is for a P-port RX8 engine yet it seems as if
your drawings are for the standard renesis exhaust setup.

I could be mistaken but when you convert to PP, doesn't the exhaust come
peripherally out of the  two trochoids, rather than going through the end
and middle plates as in the unaltered variety?  Wouldn't this yield 2  ports
with 2 headers into the muffler?

Unless the drawings are for a 3 rotor, in which case they make sense to me,
there are 3 headers coming out of the engine, front, back and mid plates
as in  the unaltered renesis

Enquiring mind wants to know

Rich

The p-port RX8 engine still uses the side exhaust. It idles as well as a
stock 13B and it is quieter and less destructive on mufflers than a
p-port 13B. I was plesantly surprised to find almost no loss of
power over a p-port 13B.

Check out http://www.youtube.com/watch?v=NKJ00JsnS8A

BTW Jeff is taking over making p-port rotor housing out of your rotor
housings. He is much better equipped to do that than me.
Contact Jeff at jeff doddridge <4starr@cox.net>

Paul Lamar