Peterbilt 357/378 Engine & Performance Parts offers a wide range of high-quality upgrades and replacements to enhance the power, efficiency, and durability of your Peterbilt semi-truck. Whether you need turbochargers, fuel systems, exhaust components, or engine parts, this product lineup has the top-tier products to optimize your Peterbilt's performance. From Bully Dog tuners and FASS industrial fuel pumps to Borg Warner turbochargers and Caterpillar engine parts, these parts deliver proven results for boosting horsepower, torque, and fuel economy. With a focus on heavy-duty, class 8 applications, this product lineup caters to the needs of Peterbilt owners seeking reliable, long-lasting upgrades to keep their trucks running strong.