Diesel World - September 2025

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From shop tours to drag strips, the September issue of Diesel World is full throttle. On the cover, Nick Hotz’s Fourth-Gen RAM gets a timely upgrade, blending practical mods with performance precision. Inside, we visit Northeast Diesel Service of Springfield, a cornerstone of the diesel scene since 1976, where they breathe new life into a Cummins P-pump. Trey Peck’s Flat Back Duramax shows off farm-built strength and creativity, while the F-450 Pride of Claremore flexes Liberty Forged's latest innovation in heavy-duty style. The feature-packed issue also includes a High-Pressure Hummer H1 that took seven years to complete and now delivers unstoppable power, plus an update on our Stock to Not editorial build and a close-up on Dirtymax Jack’s legacy. Event coverage hits hard this month with Southwest Truck Fest, FASS Dyno Day, and the always-popular Rudy’s Spring Jam. On the tech side, we take a deep dive into gear swaps for late-model RAMs and explore the surprisingly cool rise of diesel motorcycles. If you live for diesel performance, community, and innovation—this one’s for you.