tyrant Posted June 18, 2011 Share Posted June 18, 2011 I have a 1980 RD that is really loud.... want to see if there is a good generic stack that will drop the DB's.Has anyone updated to a quieter stack ??Thanks,Norm Quote Link to comment https://www.bigmacktrucks.com/topic/19442-new-exhaust-stack-options/ Share on other sites More sharing options...
Rob Posted June 18, 2011 Share Posted June 18, 2011 A good muffler would help tremendously to quiet an engine.Rob 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/19442-new-exhaust-stack-options/#findComment-79876 Share on other sites More sharing options...
Mackpro Posted June 18, 2011 Share Posted June 18, 2011 Go to donaldson's website with your measurments and see what matches up and look at the DB reduction (sound level) to get the quietest they got. We (mack dealership) order single mufflers from them all the time. We have ordered some high flow prefromance mufflers from them for CX/CH trucks with great results. https://dynamic.donaldson.com/webc/WebStore/hierarchy/hierarchy.html?section=10022 Quote Link to comment https://www.bigmacktrucks.com/topic/19442-new-exhaust-stack-options/#findComment-79886 Share on other sites More sharing options...
Lmackattack Posted June 18, 2011 Share Posted June 18, 2011 I run straight stacks on a turbo 6cyl and it is not loud in the cab. If you want to reduce cab noise you will have to insulate it with foam rubber and sound deadner. The sheet metal acts like a drum head when nothing controls its resonance. Fire wall and floor has the most vibration. Quote Link to comment https://www.bigmacktrucks.com/topic/19442-new-exhaust-stack-options/#findComment-79888 Share on other sites More sharing options...
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