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We installed the new door seal on our M20C yesterday afternoon. We used the Knots2U seal based on what I read in @Marauder's New Door Seal thread. We bought their adhesive and remover. This evening we took her for a test flight with a short hop for a $100 enchilada plate and some cheap avgas. The new door seal is working better. The old HD seal was so poor that the front seat passenger shirt tail would get sucked out under the door. That doesn't happen any more. However... On final approach to our destination we noticed a baritone hum coming from the door. The pitch and intensity changed slightly with airspeed, and the sound became intermittent when encountering turbulence. Definitely a new sound, which means it is the door seal- that is all we have changed. On the trip back the noise was a bit louder- happening over a wider range of airspeeds, seems like whatever is vibrating is getting better at it. Upon landing, we inspected the seal and it is still adhered to the door. No obvious changes there. We installed it according to the instructions, which was to install the "L shaped" seal with the thick part adjacent to the a/c skin. Abut the door frame except near the hinge, when the seal shall be installed as near to the hinge as possible. The sound seems to be coming either from the area of the door hinge or maybe from the seal at the bottom of the door. Anyone dealt with this? I don't think that the seal is quite thick enough for our a/c. My guess is that the part of the L we installed by the hinge, that is not next to the skin or the door frame, is what is vibrating. My gut tells me to either backstop it with some intermittent beads of silicone, or thin HD door seal material. Please, somebody has to have troubleshot a solution for this issue already???

Hello, I'm in the market for a mooney (most likely m20c) and want to basically find one with no damage history and a relatively new engine, but that's it. My plan is to then get it painted, have the interior redone, and have new avionics installed. Has anyone had experience with this? And what mods are important/beneficial for a model c? I know there is a cowl conversion to help with cooling and speed, but are there any other ones?