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The patient: 1976 F-250; 460 engine; C6 transmission. It has the auxiliary fuel tank on the driver's side.
It has a single muffler on the passenger's side. The two 2-1/2 inch exhaust pipes connect to the muffler. One 2-1/2 inch tail pipe exits the muffler.
Two 2-1/2 inch exhaust pipes entering muffler
One 2-1/2 inch tail pipe exiting muffler
I'm wondering if it is possible to modify the muffler to add a second tail pipe parallel to the original. I'd like the two tail pipes to flow approximately the same. The objective is to get a better flow to the exhaust without increasing the noise level.
You really can't modify the muffler because it has an inlet and outlet built into the interior you'd miss if you cut another opening.
a 3" single adapted right behind the muffler would be your best bet. the short 2 1'2 section wouldn't restrict things much at all. though I really question if the benefit would be worth the effort.
The other thing you could do it what I have, put two 48" glass packs on your head pipes and run 2 1/2 tail pipes off those. it has a soft mellow sound that beats the high dollar exhaust systems I've put on muscle cars all to heck. I never liked glass packs but it was because they were too short, long ones sound great.
