Paul wrote:

Keep alert for a slow loss of power Finn. That internal structure could slowly
melt and partially or completely block the outlet. If it can happen in my
C182 with a piston engine and long exhaust manifold pipes it can happen
faster with a rotary.

Paul Lamar

Finn Lassen wrote:

OK, I will. BTW, I forgot to mention that the area of the exhaust pipe being hit
directly by the header pipe stream is not perforated, the reverse side is. Also note the
double wall where the header stream hits. I started out with an 5" diameter stainless
pipe, but didn't have room, so I cut it lengthwise and squeezed it into an oval.

As far as cracking is concerned, how about cutting through one of the header pipes and
sticking it into stainless flex tubing (won't leave much space for EGT probe though)?

 
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