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Put a harder pull on it and see if it gets any louder!  Might not be workin' it hard enough to get enough heat in the exhaust.  My 611 didn't make much sound either...bobtailing.  The 611 I used to work would get much louder when it was actually pulling.

"Eagles may soar, but weasels don't get sucked into jet engines."

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I once had a B model with a 711 and the local mack dealer put a turbo on it, it really had a whistle, had alot of people tell me they could tell it was me before they saw me! and it pulled real good in a dump truck.    terry:MackLogo:

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