Quite mufflers help. Had to replace exhaust system/pipes on my 52 once, thought the old muffler was OK, original design/shape muffler. The new one looked about the same as the old but was much quieter in the cab, it was nice.

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-