Hi
After toying with this software
JavaPipe: Tuned Pipe Designer
The simulated pipe was around 1 m long and 34 mm diam center section
I used the first portion of the exhaust, added a 34 mm internal diam pipe and welded the stock muffler to the pipe end
Btw I opened the stock end tube restriction
Total length around 1m
Painted it black
And started the engine
Sound is a tad louder, but the open end tube gives it a higher pitch
Performance is much better
The engine reaches the vibration rpm limit faster
Now it is time to install the 36t sprocket
Peace
After toying with this software
JavaPipe: Tuned Pipe Designer
The simulated pipe was around 1 m long and 34 mm diam center section
I used the first portion of the exhaust, added a 34 mm internal diam pipe and welded the stock muffler to the pipe end
Btw I opened the stock end tube restriction
Total length around 1m
Painted it black
And started the engine
Sound is a tad louder, but the open end tube gives it a higher pitch
Performance is much better

The engine reaches the vibration rpm limit faster
Now it is time to install the 36t sprocket
Peace