MBRP FS9CA455 4" T-409 SS Down-Pipe for 2008-10 Ford F-250/350/450 6.4L

Vehicle Fitment

• 2008-2010 Ford F-250 Super Duty (6.4 L PowerStroke, diesel)
• 2008-2010 Ford F-350 Super Duty (6.4 L PowerStroke, diesel)
• 2008-2010 Ford F-450 Super Duty (6.4 L PowerStroke, diesel)

Features

• 4.00" diameter mandrel-bent tubing crafted for enhanced exhaust flow
• Constructed from high-grade T-409 stainless steel in the XP Series
• CARB E.O. number D-763-1 on file for legal use in California and other states
• Designed with precise jig manufacturing to ensure accurate fitment and clearance
• Reduces back-pressure and helps lower exhaust-gas temperatures (EGTs) under heavy duty or turbocharged applications
• Direct-fit down-pipe that uses factory mounting points - minimal fabrication required
• Ideal upgrade for performance, towing, and high-flow exhaust systems
• Lifetime warranty on the T-409 stainless variant for long-term durability

Specifications

• Part Number: FS9CA455
• Piping Diameter: 4.00" (≈101.6 mm)
• Material: T-409 Stainless Steel (XP Series)
• Fitment Years: 2008-2010 Ford Super Duty F-250/F-350/F-450 with 6.4 L PowerStroke
• Emissions Status: CARB E.O. # D-763-1 - legal in California with proper installation

Included Components

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

Product Description

The MBRP FS9CA455 down-pipe is engineered for the 6.4 L PowerStroke diesel engines in 2008-10 Ford Super Duty trucks (F-250/F-350/F-450). With its full 4" mandrel-bent design and premium T-409 stainless steel construction, this down-pipe offers significantly improved exhaust flow and reduced back-pressure - making it ideal for turbo upgrades, towing builds and high-flow exhaust systems.

With direct-fit design using factory mounting points and precision manufacturing, installation is simplified for qualified technicians. The inclusion of a CARB Executive Order (D-763-1) means this kit can meet emissions-legal status in California and other states if installed properly. Always confirm your truck uses the 6.4 L PowerStroke engine and falls within the 2008-2010 model years. Compatibility beyond 2010 is **unconfirmed at the time of listing**.