I see many people are using the short type (821) also on plug in wing airframes where there is no real space concerns to have a short pipe. What are the pros and cons of this?
I guess some weight could be saved, and that it could be nice to have a shorter pipe tunnel, but I imagine that having the exhaust further to the front require a lot of extra wiping to clean the of the oil after flight?
What is the conclusion regarding noise between the long and short hatoris?