Tom,

I had the muffler-fellow put what "you call" a glass pack smack in the center area to replace the paired resonators; L and R. The inlet and output were in line so I am calling it a glass pack,as u described.. ID's/OD's were same so I figured no restriction. That was 3 years ago. I think it cost $30 plus labor. It was bout 12-14 inches long and about 3-4 inches in diameter. It isn't that much fatter than the pipe so easy to install but you have to pay attention when you locate it with driveshft there. This is easy at shop on lift.

Then I purchased 2 cut lengths of steel flat bar at ace hardware and we used these "to tack weld to main pipe" (on top), and these reached out left and right to connect , "with a tight bent loop at end", to the Square rubber hangers on the sides of the car. You need this to keep the pipe from swaying left to right. You must do this.

Ace hardware has these precut flat bars in 4 foot lengths. I want so say they were flat bar 3/8" wide or 1/2" wide, BY like 1/8' thick. I think the cost was $6 each, times 2. Grab some primer paint and spray them if you want, I forgot to to this.

If you find anything else as "source of noise", since I have 5-10% left still let me know!

I can tell you one thing for sure:

The car is "much quietier" now at 70 MPH or so with the "rear muffer" renewed eventhough it looked fine and no holes. What I did at center area had little affect but I wanted not to remove the center muffliing entirely nor purchase new at $300-$400 this center assembly so I put something back there for a little cost.

Amazing mine still had the original muffler on it, but it sure was shot on the inside and I didn't know it.

I still have some of the rasping sound at low RPM under load but it goes away but nothing like I had before. Good luck.

Steve

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1982 300SD