Diamond Eye Manufacturing K4312S 4in. 409 Stainless Steel Exhaust System Kit 1994-1997.5 Ford 7.3L Powerstroke F250/F350

The Diamond Eye Manufacturing K4312S is a complete 4-inch exhaust system kit designed specifically for 1994–1997.5 Ford F250 and F350 trucks equipped with the 7.3L Powerstroke diesel engine, covering all cab and bed length configurations. Constructed from 409 stainless steel, this kit offers superior corrosion resistance and long-term durability compared to standard aluminized systems — a critical advantage for diesel trucks exposed to the elements.

Key Features:

• 4-inch diameter piping for improved exhaust flow and reduced backpressure over the restrictive factory system
• 409 stainless steel construction for excellent rust and corrosion resistance
• Mandrel-bent tubing maintains consistent interior diameter throughout bends, maximizing exhaust velocity and engine efficiency
• Designed to fit all cab and bed length combinations on 1994–1997.5 Ford F250/F350 Powerstroke models
• Complete bolt-on kit — includes all necessary components for a full system installation
• Engineered to complement diesel performance upgrades including injectors, turbo, and tuning modifications

Diamond Eye Manufacturing produces their exhaust components using precision CNC mandrel bending equipment, ensuring consistent quality and fitment. The larger 4-inch diameter over the stock exhaust helps the 7.3L Powerstroke breathe more freely, which can contribute to improved exhaust gas temperatures (EGTs), throttle response, and overall turbo efficiency. This kit is a popular and trusted upgrade for first-generation OBS Powerstroke owners looking for a functional, high-quality stainless exhaust solution.