Hey RBean,
I have just done the upgrade from DLE 20 to MVVS 26cc and its a perfect match to the airframe!
Test flew last w/e with 18x10 Graupner with top RPM 7500 and the difference is apparent. I plan to test APC17x10 as the MVVS max torque is at 8000 RPM, that will add some speed in straight line
Will shoot a video next time

Here's some pics of the engine bay, I had to chop off quite a bit of the chin but I will paint the muffler in RLM 04 as the shape matches the 109's curves