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Most of the noise is coming from the firewall, floorboard, and windshield. It needs a hood blanket, soundproofing sprayed on the underside, proper boots on the shifters & pedals, and Rhinolining or similar material inside the cab. Better sealing of the doors & windshield would also help. If...

The rain cap is from Airflow. I'm sure it's just a generic flapper for agricultural equipment. The good thing is that even at a 68 degree angle it opens & closes without problems. If not, I would have had to modify the counterweight. Exhaust Rain Cap 5" Pittsburgh Power has a shorter...

Quiet Performance Classic 51.5 universal stack muffler - Pittsburgh Power - High performance diesel https://store.ftediesel.com/home/viewPrd.asp?idproduct=41&idcategory=8 Exhaust Elbow 68-Degree 5" OD/OD Exhaust Rain Cap 5"

Summary of results 900 RPM Idle: Driver 87.1 dB reduced to 83.1 dB Passenger 86.9 dB reduced to 83.8 dB 5' 85 dB reduced to 84.4 dB 10' 81.8 dB reduced to 79.7 dB 15' 78.5 dB reduced to 77.1 dB 20' 76.5 dB reduced to 74.6 dB 1500...

900 RPM at 20' 1500 RPM at 20' Driving at 50 mph driver's side Driving at 50 mph passenger's side 50 mph passenger side with window down

1500 RPM Idle Results Driver's side at 1500 rpm's Passenger side. 5' 10' 15'

900 RPM Idle Results I bought a dB meter just for this project. Curiosity was killing me beforehand. All of this is at 900 RPM idle. Also note, this is my "quiet" Deuce. The other truck is substantially louder! Pics are self-explanatory. No muffler is on left. Mufflered is on the right...

My components: Left to right are 3.5" ID to 4" ID adapter, 4" ID to 5" ID FTE Resonator, 5" OD short pipe, 5" ID Pittsburgh Power muffler, 5"OD 68 degree bend, 5" rain flap. Sorry for the shadows in pic. Inside view of the resonator. It's a right-hand corkscrew like a sea shell...