Need your help guys.

I'm flying a 73 inch ultimate with a DA50. Last weekend we had noise test at our club. The max. noise we may produce is 86 dB. My plane was measured a 95 dB. I have to do something about this but don't know what. I'm using a DA50 with a MTW muffler. For prop I use a 22/10 Mezjlik (carbon) and gives about 6800 RPM on the ground. I'm going to try to bring my air intake into the fuselage and perhaps a 3-blade prop but I don't know if it will be enough.
!!! HELP PLEASE !!!!! I am desperate. [&o]

Thanks on advance
Ronny