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4" to 5" Downpipe-Back Exhaust | 2020-2024 Ford 6.7L Powerstroke

Take off the shackles and unlock the true horsepower, optimized fuel economy, and aggressive twin-scroll turbo whistle of your Alumiduty truck. The SPEtuner 4" to 5" Downpipe-Back Performance Exhaust is a premium, heavy-duty race pipe system custom-engineered for 2020–2024+ Ford F250, F350, and F450 Super Duty trucks equipped with the 6.7L Powerstroke turbo diesel engine.

The factory emissions assembly on 2020+ models is a massive, heat-soaking bottleneck that forces your truck into constant, fuel-hungry DPF regeneration cycles. This precision mandrel-bent system connects directly to your factory downpipe outlet and steps up from a 4-inch entry into a massive 5-inch straight-through section. By completely removing the restrictive DPF (Diesel Particulate Filter) and SCR/DEF hardware, it slashes exhaust backpressure to zero and protects your engine under heavy hauling conditions.

Note: This downpipe-back exhaust system is intended for off-road and competition use only. It is not legal for use on public roads and may not be compliant with local, state, or federal emissions regulations. Please verify vehicle fitment and local laws before purchase and installation.

Key Features

• High-Velocity 4" to 5" Flow Expansion: Transitions seamlessly from a 4-inch flange to a massive 5-inch straight body, entirely eliminating the heavy, clogged factory exhaust "cork" for maximum velocity.
• Eliminate Emissions-Related Limp Mode: Permanently bypass fragile DEF heaters, bad NOx sensors, and clogged filters that constantly threaten to leave your truck stranded in "Reduced Engine Power" mode.
• Drastically Drops EGTs (Exhaust Gas Temps): Vital for the high-output 6.7L platform; dumping hot exhaust gases out faster prevents heat saturation, keeping your oil, coolant, and VGT turbo running noticeably cooler.
• Quicker Turbo Spool-Up: Removing high backpressure allows your turbocharger to spool up instantly, wiping out low-end lag and giving you immediate, usable towing torque.
• Unparalleled 6.7L Powerstroke Sound: Unleashes that signature, deep, and throaty Ford V8 diesel growl along with a crisp turbine hiss under load—designed to remain comfortable inside the cabin during highway cruising.
• Boosted Fuel Efficiency (MPG): Eliminating active DPF regeneration cycles saves gallons of raw diesel fuel over time and prevents dangerous fuel dilution inside your engine crankcase.

Why Choose SPEtuner Performance Hardware?

Don't risk your $80,000+ truck on low-grade, universal pipes that rattle or leak at the joints. SPEtuner delivers heavy-duty engineering built for severe towing and high-boost environments:

• Perfect Fitment Guarantee: Custom-bent specifically to navigate the tight clearances of the 2020-2024+ Ford Super Duty frame.
• Mandrel-Bent Structural Integrity: Smooth curves mean zero neck-down or restriction points, preserving high exhaust velocity throughout the system.
• Fast Domestic Shipping: Dispatched rapidly from our US warehouses, complete with live tracking direct to your garage.

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Fitment

• 2020-2024 Ford F-250 F-350 F-450 Super Duty 6.7L Powerstroke Diesel
• Does not fit Cab & Chassis

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FAQ

Q1: Will this exhaust system fit my truck?
A1: This system is designed specifically for 2020–2024 Ford F-250, F-350, and F-450 trucks equipped with the 6.7L Powerstroke diesel engine. Please confirm your vehicle’s year, model, and engine before purchasing.

Q2: What does “downpipe-back” mean?
A2: Downpipe-back means the system replaces the factory exhaust from after the downpipe to the tailpipe, including the mid-pipe and rear section. The factory downpipe itself is not included.

Q3: Is this a bolt-on installation?
A3: Yes. The exhaust system uses OEM-style hangers and factory mounting points for a direct bolt-on installation. No cutting or welding is required.

Q4: Does this system include a muffler?
A4: No. This is a straight-through, muffler-delete design, intended to maximize exhaust flow and deliver a louder, more aggressive diesel exhaust sound.

Q5: How loud is the exhaust compared to stock?
A5: This system is significantly louder than the factory exhaust, especially under acceleration. It produces a deep, raw diesel tone and increased turbo sound. Sound levels may vary depending on other modifications.

Q6: Will this exhaust improve performance?
A6: The larger 4"/5" diameter piping helps reduce exhaust backpressure, which can improve turbo response and support increased torque and power potential, especially on modified trucks.

Q7: What material is the exhaust made from?
A7: The system is constructed from 409 stainless steel, offering excellent durability, heat resistance, and corrosion resistance for demanding driving conditions.

Q8: Is this exhaust street legal?
A8: No. This exhaust system is intended for off-road and competition use only and may not be legal for use on public roads. Always check local, state, and federal regulations before installation.

Q9: Will this exhaust trigger a check engine light (CEL)?
A9: A downpipe-back exhaust does not typically trigger a CEL on its own, as it does not modify sensors or emissions components upstream. However, results may vary depending on other vehicle modifications.

Q10: Is tuning required after installing this system?
A10: While the exhaust itself may not immediately trigger a CEL, pairing this system with DPF, CAT, SCR, or DOC deletions requires a capable tuner to disable emissions sensors and ensure proper engine function without fault codes.