Jones are nice mufflers, not sure I got them that cheap, but they were cheaper by far and very nice quality.
Here is a video of the Mustang with Borla ProXS, 489 cid, 10.7:1, 3 inch exhaust to bumper, with H pipe
Here is one in the car with Flowmasters, keep in mind, it was quiet-ish, but at cruise it would resonate to drive you nuts.
Here is a fun movie I made a while back, you can hear the flowmasters at the end. They were cool, but not cruise friendly Jones are quiet inside
Here is the truck, 10:1 445, 3 inch mandrel bent with Jones and an X pipe
Here is the truck again with Jones
Here is the same truck with the same Flowmasters from the Mustang, (took off the Mustang, put on the shelf, sounded good but back on the shelf, same resonance at cruise)