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Anyone running a donaldson 51'' muffler on a 5'' system. Rite now i am running str8 and i am going to be making alot tirps in the near future and would like it to not drone and be a quieter ride. Still wont a little bark but, quiet. Thanks in advance.
 

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i had a buddy that ran one and it still sounded pretty good. He towed alot with his truck and didnt have any drone
 

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the 51" is M90535 and the 48" is M100465 I havent heard of anyone on here using the 48" tho but they are about 1/2 price of the 51" and they are very popular on semi's so I would assume they would flow good and most truck repair shops will have these in stock they measuer 48" long 10" dia and 5" inlet & outlet centered on each end.
 

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sorry that 51" is M090535
 
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