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.  When it comes to performance, the design of the muffler is just as critical as the exhaust diameter size: Do you want more power? Get a straight-through or low-restriction X-section …