My 2002 HD truck is now too loud. I just rebuilt the engine and replaced the catalytic converters. They were loose inside. So I get it back running and it's louder than it uesd to be. The converters were Magnaflow. I cut them off and used two new universal fit converters from NAPA. Well that was a waste of money because it's still too loud. So the only thing left is the muffler. But this truck has one big oval muffler with two inlets and two outlets.

So the big question here is, is anything available that is quieter than the original that is physically the same? Two in and two out. Maybe my original muffler had the insides break up and got louder? It has 460,000 miles on it.
Does anyone make a replacement muffler for the HD truck?
We build and dyno race engines every day, but the sound of a loud exhaust with no headers and a stock camshaft is not very pleasant. Thanks for any help.... Jon Kaase