Mufflers

 are a limited-time currency available during the Hell On Wheels 2022 Event. They are used during the Act 1 main questline, Of Clunkers and Junkers, and the total is only visible there. The counter resets after each stage of the questline and earned do not carry over from one part to the next.

How to Obtain
could have been obtained in the following ways:
 * Sending characters to their limited-time jobs at the Springfield Dump, or any Dumpster could have earned basically 5 per one finished job.

Job
Jobs that earn (non-premium / premium characters):

Muffler Prizes
US$