The 6.4L Powerstroke engine that powers 2008-2010 Ford Super Duty trucks is renowned for its performance and good towing capabilities. Many owners, however, have been having ongoing problems with the factory Diesel Particulate Filter (DPF) system.
Truck owners will look for aftermarket exhaust upgrades due to frequent regeneration cycles, increased exhaust back pressure, clogged exhaust filters, and increased maintenance expenses. A 5″ down pipe back exhaust is one of the most talked about changes. Many owners wonder if a bigger exhaust system is worth the price.
Understanding the Factory 6.4 Powerstroke Exhaust Restrictions
The 6.4L Powerstroke’s stock exhaust system is designed to meet strict emissions requirements. The factory DPF does effectively reduce emissions but results in high exhaust restrictions. As the soot builds up in the filter, back pressure will rise, thus placing more demand on the engine and creating additional heat. Numerous owners have reported reduced throttle response, increase in regeneration cycles, and increased maintenance expenses for the emissions system. These are some of the primary reasons that fans are looking to change to a larger aftermarket exhaust system.
What is a 5 Inch Downpipe Back Exhaust?
The 5″ downpipe-back exhaust is an upgraded exhaust system with a larger tube diameter than the factory exhausts behind the downpipe. The exhaust gases are not hindered and circulate easier in the larger pipe. The 5-inch exhaust can be significantly larger than the smaller sizes, giving it the ability to move a lot more air and is a popular choice for modified trucks, towing and performance builds. Product specifications claim that a 5″ system offers more flow potential, less back pressure and a deeper exhaust note than an equal 4″ system.
The 6.4 Powerstroke delete pipe combination can be found in different types of exhaust system configurations, all of which are specifically for 2008-2010 Ford Super Duty models for those truck owners that are looking for a total upgrade.
Performance Benefits of a 5-Inch Exhaust Upgrade
Improved exhaust flow is among the benefits of a 5-inch exhaust system. Efficient exhaust gas removal can lead to better performance of the turbocharger, which can help minimize turbo lag and improve response. The upgrade often makes the vehicle more responsive and its acceleration smoother.
Lower exhaust gas temperatures (EGTs) are another factor associated with reduced back pressure. Reducing EGTs especially is useful for trucks which carry heavy loads, operate in harsh environments or have other performance changes. Too hot is an issue with diesel engines, and better exhaust flow offers better temperature control.
One of the other obvious advantages is sound. A 5-inch exhaust will create a more aggressive and deeper diesel sound than an exhaust system using the factory exhaust. Many fans enjoy the more aggressive exhaust note particularly when tuned.
Potential Fuel Economy Improvements
Another consideration in playing with exhaust upgrades is fuel economy. This also means that it has the potential to run with less stress under some driving conditions as it can blow out exhaust gases more efficiently. A few owners claim better MPG after making their exhaust and tuning combination more liberal. But real-world results depend on the driver’s driving style, the condition of the vehicle, how much the person gets towed and what kind of tune he or she uses.
Proponents often state that fuel efficiency improves when the DPF parts are removed, but this isn’t necessarily true for all cars.
Comparing 4-Inch and 5-Inch Exhaust Systems
The decision of 4″ or 5″ exhaust is one that is often dependent on the truck use. A 4″ system will offer significant benefits on top of stock and is often considered to be the right choice for trucks used for daily driving with some performance boost.
Owners looking for more airflow, more aggressive sound and increased performance potential from their modification often prefer to go with a 5″ system. The bigger diameter design is better suited for trucks equipped for heavy towing, racing or advanced setup purposes. The 5-inch size option offers more airflow potential and reduced back pressure than similar 4-inch systems, according to manufacturer comparisons.
Installation Considerations
Owners of any DPF delete exhaust system should know that proper tuning will be required. The elimination of emissions-related components, if not properly programmed with software, may result in warning lights, fault codes, and driveability-related problems. It is noted specifically by manufacturers that often a compatible tuner is required for correct operation following installation.
Installation can be done by the experienced DIY mechanic, but it’s recommended for anyone who is not very familiar with diesel exhaust systems to get it done professionally. Correct fitment, sensor management and tuning are vital to achieving the desired results.
Real-World Owner Experiences
When considering factory restrictions, exhaust system upgrades, and other diesel truck reliability and elimination of emissions-related issues, it is easy to see that these are frequent topics of discussion throughout the communities. There are numerous owners that report improved throttle response, more power and fewer headaches from the regenerative. Meanwhile, others point out that maintenance, tuning quality, and the overall state of the vehicle are all important considerations in long-term reliability issues.
These experiences prove that having a bigger exhaust can help you make some real gains in performance but it’s not the solution to all the problems with the 6.4L Powerstroke platform.
Does the 6.4L Powerstroke 5-Inch Downpipe-Back DPF Delete Pipe Make Sense?
A 5-inch exhaust system may be a worthwhile modification for owners who want to maximize exhaust gas flow, improve the throttle response, cool exhaust gas and make a more aggressive exhaust note. The 6.4L Powerstroke 5-inch Downpipe-Back DPF delete pipe is a 5-inch pipe that is larger flowing than the applicationen’s factory program.
The upgrade’s worth ultimately hinges around the use of the truck. Some daily drivers might find a 4-inch system will work fine, but those who tow and performance-oriented owners may want the extra airflow from a 5-inch system. Owners must check local emissions regulations, ensure that they know the potential legal implications before making any changes and have the appropriate tuning support for their truck so that it will operate safely.
