DieselSite OBSBU 409 Stainless Steel Bellowed Up-Pipe Kit for 7.3L Powerstroke

The DieselSite OBSBU Bellowed Up-Pipe Kit is a premium 409 stainless steel replacement for the factory up-pipes on the Ford 7.3L Power Stroke diesel. Engineered to permanently address the chronic leaking and failure issues common to the original equipment up-pipes, this kit delivers a durable, leak-free solution with a direct-fit installation requiring no modifications.

The OEM up-pipe design relies on flat gaskets and rigid pipe connections that are prone to leaking as the exhaust system heats up and cools down over time. DieselSite redesigned the system using a bellowed pipe construction paired with a donut-style gasket that naturally absorbs the thermal expansion and contraction of the exhaust system — eliminating the stress placed on the sealing surface and preventing future leaks.

Key Features:

• Constructed from 409 stainless steel for long-lasting corrosion and heat resistance
• Bellowed pipe design accommodates thermal expansion and contraction without gasket stress
• Superior donut-style gasket targets the original Ford design failure point
• Direct OEM replacement — no cutting, welding, or modifications required
• Complete hardware kit included for straightforward installation

What's Included:

• Both up-pipes (left and right)
• Collector
• Donut-style gaskets
• All mounting hardware and bolts

The DieselSite OBSBU is the definitive up-pipe upgrade for 1994–1997 Ford OBS trucks equipped with the 7.3L Power Stroke diesel, restoring proper exhaust flow and eliminating the exhaust leaks that rob turbo performance and allow harmful gases into the engine bay.