58GreenMackB Posted March 6, 2018 Share Posted March 6, 2018 Hi all. Working on getting parts together for overhauling my engine next summer and one of the things on my list is putting a muffler on it. It is brutal to ride in that thing for long periods of time with a straight pipe. Anyways, I am looking for the 8.5" diameter Mack mufflers that are stainless steel. So far I haven't had much luck finding anything other than aluminized. Can anyone point me in the right direction? Barry mentioned that PAI used to have them, but wasn't able to find anything with my internet search. Quote Link to comment https://www.bigmacktrucks.com/topic/52715-b61-model-stainless-steel-muffler/ Share on other sites More sharing options...
j hancock Posted March 6, 2018 Share Posted March 6, 2018 You can have one made in stainless. http://www.grpipes.com/stainlesspipesandmufflers.asp Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/52715-b61-model-stainless-steel-muffler/#findComment-393524 Share on other sites More sharing options...
Freightrain Posted March 6, 2018 Share Posted March 6, 2018 I found the muffler on the cab had near as bad drone inside as the rattle from a straight pipe. I ended up putting a Dynomax 4" "racing" muffler(basically a big cherry bomb) under the cab and then a pipe up the side. Clean look and made it bearable noise level inside. You could get a std muffler and have it ceramic coated silver? Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/52715-b61-model-stainless-steel-muffler/#findComment-393540 Share on other sites More sharing options...
Hobert62 Posted March 9, 2018 Share Posted March 9, 2018 I agree with freightrain alot of the noise comes from the exhaust mounted to the cab. My dual 6" straight stacks are frame mounted and I don't hear any noise from them over the engine. Quote Link to comment https://www.bigmacktrucks.com/topic/52715-b61-model-stainless-steel-muffler/#findComment-393733 Share on other sites More sharing options...
Rob Posted March 9, 2018 Share Posted March 9, 2018 A piece of 4" X 6" .250"-.500" thick silicone rubber cloth sheet is an effective isolator for the rumble from the cab supported exhaust stack. The original rubber sheet used becomes hard from age/exposure and is ineffective. A stainless flex pipe installed under the cab into the exhaust pipe is also effective and the combination of both together yields a very near resonate free exhaust system. 1 Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/52715-b61-model-stainless-steel-muffler/#findComment-393749 Share on other sites More sharing options...
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