ORIGINAL: tele1974
Most of that is air frame noise. I have the same bird and the thing is loud. I am working on quieting a few things down. Most of that noise is from the ball links on those big barn doors of ailerons.
I have soft mounted the SAP 180 in the EFXtra as shown in the thread for that plane. I believe I posted a bunch of photos on that. Much quieter set-up. Expect 3-6 dB delta on noise