4 inch T409 Stainless Down Pipe

Features:

• Replaces restrictive factory turbo downpipe
• Improves exhaust flow and turbo efficiency
• Enhances overall engine performance and response
• Made from durable T409 stainless steel
• 4-inch diameter for high-flow performance
• Increases fuel economy under load
• Corrosion-resistant for long-lasting durability
• Ideal for towing and performance applications
• Direct bolt-on installation with no cutting required
• Designed for 2008–2010 6.4L Powerstroke engines
• Compatible with most aftermarket exhaust systems
• Not legal for sale in California

Let Your Powerstroke Breathe The Way It Should

If you're running a 6.4L Powerstroke from the 2008–2010 era, chances are your stock downpipe is holding your truck back. The MBRP FS9455 4-Inch T409 Stainless Down Pipe is an easy and effective way to unlock more performance without diving into a full exhaust overhaul. Right out of the box, it improves airflow, reduces backpressure, and gives your turbo the freedom to spool up faster. That translates to better throttle response, increased efficiency, and stronger performance whether you're towing a load or just enjoying a spirited drive. Built from tough T409 stainless steel, it's made to withstand heat, corrosion, and years of hard use. The 4-inch diameter gives your exhaust gasses a straight shot out, helping reduce strain on your system and supporting future upgrades. If you're ready to let your engine breathe and perform like it was meant to, this MBRP downpipe is a smart first step.

Engineered To Outflow And Outlast Stock Components

The MBRP FS9455 is a 4-inch turbo downpipe constructed from high-quality T409 stainless steel, designed to directly replace the restrictive factory downpipe on 2008–2010 Ford F250 and F350 6.4L Powerstroke trucks. Its larger diameter and smoother bends significantly improve exhaust flow, helping reduce turbo lag and lower exhaust gas temperatures under load. This makes it especially useful for trucks that tow, haul, or operate under heavy throttle for extended periods. The T409 stainless construction offers a solid balance between strength and corrosion resistance, making it a reliable long-term solution even in harsh weather or road salt conditions. The design allows for bolt-on installation, with no cutting or major modifications needed, making it a convenient upgrade for DIYers or shop installs. It’s compatible with most aftermarket exhaust systems, making it a flexible piece in a larger performance build. Note that this product is not approved for sale or use in California and may require emissions compliance verification depending on your region.

Fits: 2008, 2009, 2010 Ford F250/F350 6.4L Powerstroke

Notes:

• Designed to replace the restrictive factory downpipe
• Fits 2008–2010 Ford F250 and F350 6.4L Powerstroke engines
• Improves exhaust flow for better turbo efficiency
• Made from corrosion-resistant T409 stainless steel
• Intended for off-road or competition use in many areas
• Not legal for sale or use in the state of California
• May violate emissions laws depending on your location
• Check local regulations before removing OEM catalytic equipment
• Compatible with most aftermarket exhaust systems
• Installs easily with a direct bolt-on fitment