MBRP FS9401 4" T-409 SS Down-Pipe for 1999-2003 Ford F-250/F-350 7.3L

Vehicle Fitment

• 1999-2003 Ford F-250 Super Duty (7.3 L PowerStroke, diesel)
• 1999-2003 Ford F-350 Super Duty (7.3 L PowerStroke, diesel)

Features

• 4.00" mandrel-bent tubing for superior exhaust flow
• Constructed of T-409 stainless steel for long-term durability
• Direct-fit bolt-on down-pipe designed for the 7.3 L PowerStroke platform
• Helps reduce exhaust back-pressure and lower EGTs under heavy load
• Manufactured with precise jig-bends for accurate fitment and clearance
• Supports performance upgrades and high-flow exhaust systems
• Designed for heavy-duty diesel use, including towing and truck builds
• Note: Not verified for emissions compliance in all jurisdictions (e.g., CARB states)

Specifications

• Part Number: FS9401
• Piping Diameter: 4.00" (≈101.6 mm)
• Material: T-409 Stainless Steel
• Fitment Years: 1999-2003 Ford F-250/F-350 with 7.3 L PowerStroke diesel

Included Components

• 1x down-pipe assembly (4" T-409 stainless steel)
• 1x mounting hardware kit (gaskets, bolts/nuts/clamps) for turbo/outlet connection
• 1x installation instruction sheet

Product Description

The MBRP FS9401 down-pipe is engineered specifically for the 7.3 L PowerStroke diesel engine in 1999-2003 Ford F-250 and F-350 Super Duty trucks. With its full 4" diameter and premium T-409 stainless steel construction, this down-pipe offers improved exhaust flow, helps reduce back-pressure and manages exhaust gas temperatures under load - ideal for heavy-duty or performance-focused applications.

Installation is designed to be straightforward, with bolt-on fitment using factory mounting points and optimized for the 7.3 L diesel platform. This product is well suited to truck owners upgrading their exhaust systems, turbo setups or seeking robust durability under demanding conditions. While coverage for 1999-2003 is confirmed, compatibility beyond those years is **unconfirmed** at time of listing. Always verify your engine, exhaust layout and local emissions regulations before purchasing.