The 4 State Trucks Blog

This guide covers everything you need to know about aftermarket semi truck manifolds, alongside useful information about the various manifold brands we sell. After reading, you'll be able to accurately diagnose a leak, choose between a stock replacement or a high-flow ceramic upgrade, and ensure you get the exact fitment for your engine block and chassis. How Exhaust Manifolds Work (Quick Recap) The manifold funnels the hot fumes from the engine’s cylinder head into a single, high-powered …

Let’s break down how to maintain peak emissions performance and avoid excessive repairs. In this guide we’ll cover the various Diesel Exhaust Fluid (DEF) and Diesel Particulate Filter (DPF) products and their functions, from gaskets and clamps to slipcovers. DPF and DEF systems aren’t related in any way. But they’re both critical aftertreatment systems for toxic exhaust emissions on a big rig.  Diesel Particulate Filters: The History, The Controversy Before 2003, th …