The 4 State Trucks Blog

Bully Dog prides itself in heavy duty diesel performance parts that boost airflow, exhaust efficiency, turbo responsiveness, and engine monitoring for heavy-duty diesel engines. Here's who they are, why they stand out, and what parts you should consider getting.  The Bully Dog Backstory Founded in 1998 in American Falls, Idaho, Bully Dog carved out a niche witin loight-duty diesel performance (pickups) before expanding to the Class 8 big rig niche.  Derive Systems Merger (2014): Bully …

Painted vs. Stainless Steel Truck Visors: Which Is Better? Choosing the right semi truck sun visor impacts more than appearance—it affects durability, maintenance, cost, and long-term value. Many drivers comparing painted vs stainless truck visors are deciding between a clean, color-matched OEM look and a bold, polished stainless finish. Both options serve the same functional purpose, but they perform very differently in real-world conditions like UV exposure, road salt, debris, and harsh …

If your semi truck turbocharger is failing, you'll encounter a few common signs. In this post, we'll cover what those are, and similar symptoms that aren't actually the turbo, but a related part.  Signs the Semi Truck Turbocharger is Failing Loss of Power: The truck struglges on grades, loses mid-range power, responds poorly to throttling, and takes longer to recover speed after shifting gears. Unusual Smoke: The exhaust smoke changing colors is a big warning sign. Rising Oil Usag …

MHC Kenworth doesn't just sell heavy duty trucks and truckp parts, it prides itself in having the largest Kenworth dealer network, 130+ service locations across 19 states, 50 years of industry experience, 24/7 RoadAssist, and over 185 mobile service trucks. Here's a behind-the-scenes look at the MHC Kenworth brand, and why drivers continue to trust it. MHC Kenworth's Origins and Expansion Murphy-Hoffman Company got its start in 1975 as a small family-owned business.  Today, they're the cent …

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 …