We ship to every state of USA Welcome to 4DPF your trusted partner with years of experience and countless satisfied customers in providing top-notch aftertreatment solutions. We specialize in designing and producing DPF and DEF/SCR delete kits specifically tailored for heavy-duty machines like Kubota, Volvo, Caterpillar, Isuzu, and many others! Since our inception in 2011, we take pride in being the pioneers in offering aftertreatment solutions for heavy construction and agricultural machinery. Our solutions are the result of extensive experience and expertise in working with exhaust systems, ensuring optimal performance and reliability.