Good evening,


I need to build a custom oval exhaust for 912 due to low space on my engine compartent.


Rotax call for 5.7 L, if this value is less ther's performance reduction?

I saw on other custom one  an internal flange with few hole , seems is made to separate the muffler in two parts avoiding gas caming from rh side to  lh .

Lh side gas pass from it's half part of muffer to holes and then on rh chamber and discarge outside ( discarge tube takes gas from rh chamber)


There's a a reason for that ?





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