ORIGINAL: BTerry
After I typed my response I realized you are in Denmark and probably have tight noise restrictions. That being said, you should probably look at a something like the MVVS 58 with its cannister system.
I have no idea how the DL will respond to a pipe but it may work well. Setup is critical and if the system is too short (or too long) it will ruin the power output. I fear the system may be too long for your plane.
It is worth a try, and the plane will fly fine, but might not have the power you desire.
The DA and ZDZ 80cc engines I mentioned are SMOOTH, I wouldn't worry a bit about vibrations damaging the plane. Power is a different story but you can always throttle back.
Thank you for your answer.
I'll think about it, I just don't want a plane that is underpowered nor one which is too heavy either.
I think I have to consider to buy a lighter plane instead, maybe the EF Yak 88' og the SD-Models 30% Yak. Maybe the weight of those is more suitable for the DL-50.
When that is said, I still have in mind to try the Es-Composite Tuned pipe option for the DL-50
Thank you for your help through your replies.