Hello,
Further to my Sig Sukhoi.
Same equipment and gas.
I removed the 5/8" exhaust pipes and soldered 1" pipes to the Bisson muffler.
200 RPM boost!
I use Amsoil Series 2000 2-cycle racing oil mixed as directed at 50-1.
This time at an OAT of 32 degrees F giving me a density altitude of 1500 ASL.
Beautiful February day!
Measured with a TNC tach.

Menz 22x10 "S" 6800 RPM

24 lbs thrust as measured with my spring scale known to be accurate in rough water weighing freshly caught fish!

This is in my Sig Sukhoi that weighs 16.25 lbs.
Nice performance!
Any of the newer 50's will outperform my Brison by a small margin and cost a bunch more!

Thanks
John