Managing the noise seems to be the issue. I managed the noise in C172 and C182 aircraft with Lightspeed 20XL. Still after 3 hours, headset clamp and noise fatigue. When I started flying a DA40 (360, two blade prop, aerodynamically clean) the 20XL would no longer do the job - I couldn't hear/understand ATC with take-off power. Lightspeed Zulu helped, barely. The air vents on the DA40 (older and newer) make tremendous noise - I always close them when I can. Fiberglass airplanes like Cirrus and Diamonds seem to transmit the noise more than metal - have not flown in latest Cirrus models. I have several hours right seat in B350 with active cabin noise damping and Bose headsets - beautiful - a very solid airframe, well insulated, turbine engines turning props at lower speeds than piston airplanes. Aerodynamic noise is drag. I have flown in a M20F once and I thought it was noisy like the DA40. I'm considering a M20J but I am concerned about the noise level.