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1977 Mack R-600


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Dunno, but a 320 coolpower isnt to bad at all

If the passenger window is up it's nice and quiet out side 

If I have something big and tall behind the cab it sounds fantastic climbing a hill

Hmmm , wonder what it would sound like in a tunnel ???

 

Paul 

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When I was about 12 y.o. I rode in one of my dad's F600 day cabs with a 673 NA, passenger window down. I don't know if it had a muffler but that sound was one of the things that caused my lifelong addiction to trucks (especially Macks).

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