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.