The 4 State Trucks Blog

Need to lower your exhaust and engine noise, but aren’t sure what muffler to get? We offer Pittsburgh Power, Donaldson, Automann, and BESTfit mufflers. In this quick guide, we’ll break down the basics of Class 8 semi-truck mufflers, list the top features of our aftermarket mufflers, and resonators.  Key Takeaways Mufflers control noise and exhaust flow - their performance is determined by the design. Fitment requires knowing inlet/outlet diameter, overall length, stack configu …