4-Inch Downpipe-Back Exhaust System for 6.7L PowerstrokeDesigned for 2011-2019 Ford F-250 and F-350 trucks, this kit replaces the factory exhaust components behind the turbo downpipe, including the DPF, SCR catalytic converter, and exhaust piping assembly.Unlike a short DPF replacement pipe, it provides a full Downpipe-Back route from the turbo outlet to the rear of the truck for more complete airflow optimization.Please note: This system connects behind the existing downpipe and does not replace the turbo downpipe.Turbocharger → Downpipe → Downpipe-Back Exhaust → Rear OutletHow Much Can a DPF Delete Save?The factory DPF system can create ongoing costs through regeneration, cleaning, sensor repairs, and complete DPF replacement.DPF cleaning service costsExtra fuel used during active regenerationDPF assembly replacementEmissions-sensor repair costsSavings ItemEstimated AmountFuel Cost Savings$21,000DPF Maintenance/Replacement$6,200Gross Savings$27,200Kit Tuner Cost-$1,200Estimated Net Savings≈ $26,000Based on typical use over 300,000 miles. Actual savings vary by fuel prices and driving conditions.Optimized 4-Inch Exhaust FlowThe full-length 4-inch mandrel-bent tubing maintains a consistent diameter without wrinkles or bottlenecks.Smooth bends: Support unrestricted exhaust flow.4-inch diameter: Increases flow and reduces backpressure.Precision TIG welding: Helps prevent leaks and improve durability.The improved flow supports engine efficiency under towing or heavy-load conditions. The 4-inch design also delivers a deeper exhaust note without the more aggressive sound commonly associated with a 5-inch system.Power and Driving ResponseWith proper tuning, improved exhaust flow may provide:Faster turbo responseMore responsive throttleLower sustained exhaust gas temperaturesSmoother acceleration under loadDepending on the setup, gains of 30-80 horsepower or more may be possible, along with a deeper and stronger exhaust sound.Installation and TuningTuning is required to prevent warning lights and diagnostic trouble codes.A tuner is not included.Designed for off-road and competition use.Why Choose SuncentAuto?Trusted by diesel truck owners across North AmericaDurable T-409 stainless steel constructionDeveloped through real-vehicle testing and flow optimizationDetailed installation instructions includedFast and free U.S. warehouse shipping45-day return guaranteeResponsive technical support FAQs Will this 6.7L Powerstroke 4" Downpipe-Back DPF Delete Kit fit my truck?This system fits 2011–2019 Ford F-250 and F-350 Super Duty 6.7L Powerstroke pickup models (automatic transmission only). It does NOT fit Regular Cab or Cab & Chassis commercial trucks.Does this 6.7 Powerstroke DPF delete kit include a tuner?No. A compatible DPF delete tuner is required but not included.Can I install this exhaust system myself?Yes, if you have mechanical experience and proper tools. Installation typically takes 2–4 hours. Professional installation is recommended for best results.What material is this exhaust made from?This system is made from 409 stainless steel, which offers a strong balance of heat resistance, durability, and corrosion resistance for exhaust applications.How does 409 stainless steel compare to aluminized steel?409 stainless steel generally provides better long-term durability and corrosion resistance than aluminized steel, especially in high-heat or harsh driving environments.What sound difference can I expect?Compared with the factory exhaust, this system typically produces a deeper, louder, and more aggressive exhaust note. Read More