Mufflers
Hello friends. I'm going crazy searching online for replacement mufflers for my coach. see my profile for make, model etc. If you have the same workhorse UFO chassis with GM Vortec 8.1 in the rear, I...
Forum Discussion
If you do change to a low restriction muffler, you may also want to consider having your ECM re-programmed to take full advantage of it. Anything that changes the exhaust flow will change the way the ECM adjust the other parameters as you drive.
