The setup for the most power may not appeal -or it may -
as you pipe tune for most hp -you may cause a nasty step in the throttle response.
This will show up on larger props .
It is not a ZDZ problem -it is simply how resonant tuning works - for all around good performance increase - on a tuned setup --- the KS 80 can with front in -rear out -and 12" of header and a Mejzlic 26x10 --is a decent starting point.
IF--the plane is light -a heavier prop load may work just fine - IF you run wide open all th time -you can go even shorter and get more max power but you will soon run into a carb flat spot which you will likely over lean the engine to try and fix.
The engine has to use more fuel to produce more power
Don't buy into any talk of more power on less fuel - that's simply wistful thinking.
The catch here is that low and midrange do not want more fuel but as the resonant tuning kicks in -the engine wants a LOT more fuel - Fuel consumed = power. forget BS talk to the contrary.
So If engine setups are not your cup of tea - keep the tuned setup on the mild side
You may find that a non tuned - good quiet muffler on a very short header is better for YOU.
In this case - a 70/80 JMB can .
the total power is not as high as the tuned setups -but the throttle is easy to adjust and power is still very good.
We run different setups on our 80 singles - for 3D- a JMB muffler - for max power - a tuned pipe.
If you really understand pipe boost and how it requires fuel and pay attention to carb tuning and related prop setups -you can make this 80 perform with or better than most 100's
Not looking for any arguments .