The 4 State Trucks Blog

Want to protect and clean your diesel fuel system in one go? The FASS (fuel air separation system) is the ideal aftermarket performance upgrade. Here's why.  FASS stops contaminants (air/water/debris) from entering your fuel stream and achieves consistent fuel delivery to your engine with this high-ROI performance upgrade. FASS's adjustable lift pump and fuel filtration systems are carefully engineered to perform beyond the limitations of standard OEM fuel delivery components, like the stoc …

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 …

If you're looking for a way to dramatically enhance the look and presence of your semi truck at night, then you can't go wrong with installing some undercarriage chicken lights.  Need inspiration? Here are some of the best-looking nighttime rigs that utilize under glow lighting to their advantage! These under glow lighting styles ADD to the overall theme of each truck, accentuating or complementing the existing primary lighting style pattern.  Why Underglow Lighting is So …

Cost, convenience, and make/model fitment are the top priorities when it comes to buying aftermarket parts online. However, you should avoid common mistakes when buying aftermarket components, and be wary of some of the most pervasive myths in the aftermarket industry.  The purpose of this guide is to help you spot red flags, properly cross-reference parts, and be well-equipped with some buying tips.  First Tip: Identify Your Needs When it comes to replacing OEM parts and upgrading exi …

Tony Huttenstine is a seasoned owner-operator. Over the years, he has poured enormous time, money, and energy into customizing a retro-style Kenworth W900L truck from top to bottom, aiming to complete a classic 80s or 90s Kenworth Aerocab look.  Dive Into the Parts List Discover the aftermarket parts and accessories used in this custom build! In this month's Haul of Fame, we take a behind-the-scenes look at the heavy-duty truck parts and accessories that make this custom Kenworth W9 …