I have only ever owned one diesel with a muffler - an Irvine 20 - and it was noticeably quieter than a similar size glow engine. How is it with the smaller engines? Does the performance suffer a lot from using a muffler? I like quiet models (which is why I fly electrics) and with proper noise reduction I might be able to get away with flying an I/C model in otherwise noise sensitive areas. IIRC correctly the PAW 55 with stock muffler and perhaps an extra muffler can be VERY quiet. Is this true? To some extent the added weight and performance drop can be compensated for by todays light R/C equipment.

Best regards

Michael