yes a simple muffler and simple hookup
Easy to do
The problem is defining "easy".
Here is a pic of an "easy setup - the single cyl engine is tilted -the header is 5" long (overall) the can is 8" long - could be shorter and fatter .
a simple coupler at front - a round spud mount at rear - no tuning - just very quiet and less money than some "In cowl" ."mufflers?"
The concept will work on any engine.
The result is NO power losses and very quiet operation.
The downside
a small box -open on the bottom to let out heat.
The ARF flyers - typically do not want to ever touch a knife or a saw.
Ideally, they buy at the shop and head for the field.