MBRP FS9459 4" T-409 SS Down-Pipe for 2011-14 Ford Super Duty 6.7L PowerStroke

Vehicle Fitment

• 2011-2014 Ford Super Duty (F-250/F-350/F-450) with 6.7L PowerStroke diesel engine
• 2015 Ford Super Duty (Cab & Chassis) with 6.7L PowerStroke diesel engine

Features

• 4.00" diameter mandrel-bent tubing in premium T-409 stainless steel for maximum flow
• Direct-fit turbo down-pipe engineered specifically for 6.7L PowerStroke platform
• Improves exhaust flow up to ~20 % over stock, improving turbo spool and throttle response
• Maintains safe exhaust-gas temperatures (EGTs) under heavy load or performance use
• Bolt-on installation using factory turbo mounting points - no major fabrication required
• Durable heavy-duty construction suitable for performance, towing or off-road applications
• Not CARB-legal for sale in California or states with equivalent aftermarket emissions regulations
• Lifetime warranty on T-409 stainless steel variant when registered per manufacturer

Specifications

• Part Number: FS9459
• Piping Diameter: 4.00" (≈ 101.6 mm)
• Material: T-409 Stainless Steel
• Fitment Years: 2011-2014 Ford Super Duty with 6.7L PowerStroke; 2015 Cab-&-Chassis edition only
• Exclusion: Not verified for standard 2015 pickup configurations or other years beyond listed range

Included Components

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

Product Description

The MBRP FS9459 down-pipe is crafted for serious performance upgrades on the 6.7L PowerStroke diesel in 2011-14 Ford Super Duty trucks, and 2015 Cab & Chassis models. With a full 4.00" mandrel-bent design made from high-grade T-409 stainless steel, this component significantly enhances exhaust flow and reduces back-pressure - key for turbocharger efficiency and durability under heavy towing or boosted conditions.

Installation is designed to be straightforward thanks to its direct-fit design using factory mounting points. The high-flow nature of the FS9459 makes it ideal for builds where stock down-pipes become a bottleneck - whether you're upgrading turbo systems, adding larger mid-pipes or building a performance/tow-rig. While full fitment through 2014 (and limited 2015) is confirmed, compatibility beyond those years or in standard pickup 2015 models is **unconfirmed at time of listing**. Always verify your exact engine, model year, and turbo outlet before purchase, and check local emissions regulations for legality.