Premium 4" Performance Downpipe Exhaust for 2015-2019 Ford 6.7L Powerstroke
Maximize your truck’s power and efficiency with our premium 4" Downpipe Exhaust, specifically engineered for 2015-2019 Ford F250, F350, F450, and F550 6.7L Powerstroke Diesel engines. By replacing the restrictive factory downpipe, this high-flow upgrade enhances exhaust flow straight from the turbocharger, unlocking the true performance potential of your Super Duty.
Heavy-Duty 409 Stainless Steel Construction Built for extreme environments, this 4-inch performance downpipe is crafted from high-grade 409 stainless steel. It offers exceptional thermal stability and superior corrosion resistance, ensuring long-lasting durability and reliability under heavy towing or harsh driving conditions.
Unleash Horsepower, Torque, and Efficiency Featuring a smooth, mandrel-bent 4" diameter design, this exhaust downpipe drastically reduces backpressure and optimizes turbine exhaust gas scavenging. Experience a faster turbo spool, crisper throttle response, and significant gains in horsepower and torque. Additionally, the improved exhaust efficiency helps lower exhaust gas temperatures (EGTs) and enhance overall fuel economy.
Perfect Fit & Seamless Integration Precision-engineered to match factory mounting points, this 6.7 Powerstroke downpipe exhaust ensures a hassle-free installation and seamless integration with your truck’s existing setup.
Performance & Specifications
Q1: What’s the difference between 4-inch and 5-inch exhaust systems?
- 4-inch Systems: Best for stock to moderately tuned trucks. It maintains ideal backpressure to keep your low-end torque snappy—perfect for daily driving and heavy towing.
- 5-inch Systems: Engineered for high-horsepower builds (500+ RWHP). These maximize flow to drop Exhaust Gas Temperatures (EGTs) and deliver that deep, aggressive "straight-pipe" growl.
Q2: Can a magnet stick to this pipe? Is it actually stainless steel?
- Yes. This system is built from T-409 Stainless Steel. Unlike 304-grade (non-magnetic), T-409 contains higher iron content, making it magnetic. It offers superior corrosion resistance over aluminized steel and is the industry standard for durability in harsh North American winters.
Q3: How thick is the tubing and what is its lifespan?
- We use 14-gauge (approx. 2mm) T-409 stainless steel. It strikes the perfect balance between weight and structural integrity, ensuring your exhaust survives heat cycles and road debris for years to come.
DPF Delete & Race Pipes
⚠️ LEGAL DISCLAIMER: Under the U.S. Clean Air Act, these components are sold strictly for OFF-ROAD / RACING USE ONLY. Use on public highways is a violation of EPA federal law and may result in significant fines.
Q4: Will a DPF delete kit improve my truck’s performance?
- Absolutely. By removing the restrictive factory filter, you will see:Substantially lower EGTs.Improved turbo spool-up (less lag).Better fuel economy (when paired with proper tuning).An end to "Limp Mode" caused by DPF clogging or sensor failures.
Q5: What exactly is a DPF delete race pipe?
- It is a direct-replacement straight pipe that swaps out the factory Diesel Particulate Filter. It eliminates the single biggest bottleneck in your exhaust, allowing your 6.7L Powerstroke to breathe freely.
Q6: Is a DPF delete legal for street use in the US?
- No. Removing emissions equipment violates EPA and CARB regulations for on-road vehicles. Check your local and state laws regarding emissions testing (Smog Checks) before purchasing.
Q7: Do I need a tuner after installing a delete pipe?
- Yes, mandatory. The 6.7L Powerstroke PCM must be "flashed" with a DPF-off tune (e.g., EZ Lynk, EFI Live, or SCT). Without a tuner, the truck will throw a Check Engine Light (CEL) and enter a "Limp Mode" power derate.
Installation & Compatibility
Q8: Will this void my vehicle’s warranty?
- Yes. Most dealerships will flag a deleted truck and deny powertrain-related warranty claims. Proceed with this understanding.
Q9: How difficult is the installation?
- This is a "bolt-on" installation for most experienced DIYers. While basic hand tools work, an automotive lift makes the process significantly faster. Note: Some Crew Cab or Short Bed configurations may require minor trimming of the mid-pipe for a perfect fit.
Q10: Downpipe-Back vs. Turbo-Back: What’s the difference?
- Downpipe-Back: Replaces everything from the factory downpipe to the tailpipe. It’s easier to install and very popular.
- Turbo-Back: Replaces the entire system starting directly at the turbocharger. This offers the absolute maximum performance gain but involves a more labor-intensive installation.
Q11: Is this 5-inch system compatible with Cab & Chassis models?
- No. This kit is designed specifically for standard pickup frames (F-250/F-350/F-450). Cab & Chassis trucks have different frame rails and fuel tank locations that require specialized routing.
Driving Experience
Q12: Will my truck be significantly louder?
- Yes. Expect a more pronounced exhaust note. The 5-inch straight pipe is loud and deep. If you are concerned about "In-Cab Drone" during long highway hauls, we recommend choosing our version with a high-flow muffler/resonator.
Q13: Will it pass a state emissions inspection?
- No. If your state requires a visual inspection or an OBDII "Readiness" scan, a deleted truck will fail.
Q14: Is it compatible with my existing tuner (EZ Lynk, Mini Maxx, etc.)?
- Yes, our pipes are compatible with all major tuning platforms that support "High-Flow" or "Race" exhaust settings.
Shipping & Delivery Policy
At DieselPerf, we specialize in high-performance diesel emission system accessories. Our mission is simple: to deliver the parts you need with maximum efficiency, security, and transparency. Below are the guidelines we follow to ensure your order reaches you safely.
1. Perfecting Your Delivery
To ensure a seamless experience and avoid unnecessary surcharges, please keep the following in mind:
- Precision Matters: Always verify your shipping address at checkout. Accurate data prevents costly rerouting fees.
- Address Classification: Carriers determine rates based on zoning. If your business is located in a residential area, it will be classified and billed at the Residential Delivery rate.
- Stay Reachable: Please provide a valid phone number. Carriers often need to coordinate delivery windows; missed connections can lead to significant delays.
2. Order Consolidation
To get your parts to you as fast as possible, we ship items as they become available. This means your order may arrive in multiple packages. Rest assured, you will never be charged extra for these split shipments.
3. Our Logistics Network
We partner with world-class carriers, including UPS, FedEx, DHL, USPS, and Amazon Logistics.
- Global Fulfillment: We fulfill orders from our strategic hubs in the U.S. and Hong Kong, prioritizing the location closest to you.
- Lead Times: While most orders arrive within 5–15 business days, specialty items or factory-direct shipments may require additional transit time.
4. Damaged or Missing Shipments
Your satisfaction is our priority. If your order arrives compromised, please follow this protocol:
For Damaged/Incomplete Deliveries:
- Document Immediately: Note any visible damage or missing pieces on the delivery receipt before signing.
- Contact Us: Reach out within 2 business days at service@DieselPerf.com or via phone at +1 325-013-1608 / +852 5381 0098.
- Preserve Evidence: Keep all original packaging and take clear photos of the damage to expedite your claim.
For Lost Shipments:
If a package goes missing, we will initiate a dock check with the carrier (typically taking 2–7 business days). If the items cannot be located, we will work with you to provide a full replacement or a refund.
5. Estimated Timeframes
- Processing: Orders are generally dispatched from our warehouse within 1–2 business days.
- Transit: Standard U.S. ground shipping typically takes 7–10 business days, though many items arrive sooner.
- Holiday & External Factors: Please account for seasonal peaks (Christmas, Thanksgiving, etc.) and unforeseen "Force Majeure" events like extreme weather, which may naturally extend delivery windows.
Customer Support
Our team is here to help you get back on the road.
- Hours: Monday – Friday | 9:00 AM – 6:00 PM
- Email: service@DieselPerf.com
All Dieselperf products enjoy a 1-year limited warranty starting from the date of goods receipt, covering defects in product materials and workmanship.
Warranty Coverage
This warranty only covers failures arising from original material and manufacturing defects under proper installation and normal use. The warranty is non-transferable and exclusively available to the original buyer. An order number or valid purchase receipt is mandatory for warranty claims.
Warranty Exclusions
The 1-year limited warranty does not apply to the following circumstances:
- Normal wear and tear and surface scratches generated during regular use
- Damage caused by improper installation, unauthorized disassembly or modification
- Damage resulting from misuse, accidental impact, negligence and natural disasters
- Natural aging loss of consumable spare parts
- Labor costs incurred from product disassembly, assembly and maintenance
Warranty Claim Process
- Submit Application: Email customer service with your order number, detailed fault description and clear photos or videos of product defects.
- Claim Review: Our technical team will verify the issue. Additional information or product return inspection may be required.
- Settlement Solutions: Upon claim approval, we reserve the right to take one of the following measures:
- Repair the defective product
- Replace with a brand-new authentic item
- Deliver compatible replacement parts for repair
Limitation of Liability
Within the scope permitted by law, Dieselperf shall not be responsible for any special, incidental, indirect or consequential losses, including but not limited to profit losses, business suspension losses and other economic damages.
