Author: Lawrence Z, Diesel Performance Specialist
Topic: 2015 Ford F-350 6.7L Powerstroke EGR Delete Strategy
⚠️ LEGAL DISCLAIMER: OFF-ROAD USE ONLY
The following content discusses the removal of emissions equipment, which is intended solely for off-road competition use. Modifying emission systems is illegal for street use in the United States and Canada. Please consult your local laws.
If you are preparing your 2015 Ford F-350 6.7L Powerstroke for off-road or competition use, removing the Exhaust Gas Recirculation (EGR) system is often the first step to improve reliability.
However, owners quickly encounter a fork in the road. You generally have two ways to achieve this: the Pass-Through (Blocker) method or the Full Removal method.
Both strategies effectively stop soot from entering your intake manifold. Both will stop the "Check Engine" light (when paired with proper tuning). Yet, seasoned mechanics and diesel engineers debate them fiercely. The difference isn't just about installation time—it comes down to the long-term safety of your engine's cooling system.
1. What Is a Pass-Through EGR Delete?
The Pass-Through method (often called a "Blocker Kit") is the less invasive approach.
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How it works: You install metal blocker plates at the exhaust sources to physically stop exhaust gas from entering the EGR cooler.
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The Hardware: The heavy EGR cooler assembly and the EGR valve remain bolted to the top of the engine.
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The Flow: While exhaust gas is stopped, engine coolant continues to flow through the factory EGR cooler just as it did before. The cooler remains an active part of the coolant cycle, even though it is no longer cooling exhaust gas.
2. What Is a Full Removal EGR Delete?
The Full Removal method is exactly what it sounds like—a complete physical extraction.
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How it works: You unbolt and remove the EGR valve, the EGR cooler, and all associated piping from the engine valley.
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The Hardware: These bulky components are replaced with a simplified intake block-off plate and a new coolant flow tube (often called a coolant bridge).
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The Flow: The coolant is re-routed through a dedicated hose or pipe, bypassing the location where the cooler used to sit entirely.
3. Why Safety = Coolant System Integrity (2015 Specific)
When deciding between these two for a 2015 6.7L Powerstroke, you must shift your focus from "Airflow" to "Coolant."
The 6.7L Powerstroke uses a complex dual-loop cooling system. The integrity of this system is paramount. While both kits stop the soot, the primary risk factor in a deleted truck is no longer carbon buildup—it is the potential for Coolant Loss.
Therefore, the "safer" option is defined strictly by: Which method best protects the engine from losing coolant or leaking coolant into the cylinders?
4. Technical Deep Dive: Coolant Leak Failure Mode
This is where the Pass-Through method faces scrutiny.
The factory EGR Cooler is a heat exchanger—a metal box filled with delicate internal fins and cores where coolant and hot exhaust usually meet. Even when you block the exhaust gas with a Pass-Through kit, coolant is still circulating inside that old cooler.
The Failure Mode
Over time, due to vibration, corrosion, or previous thermal stress, the internal core of the EGR cooler can crack or separate.
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In a Stock Truck: This leaks coolant into the exhaust, creating white smoke.
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In a Pass-Through Setup: If the cooler core fails, coolant can still leak internally. Since the exhaust flow is blocked, this coolant may pool or find its way into the intake or exhaust manifolds depending on the specific failure point.
The Bottom Line: If the cooler is still physically on the engine and filled with water, the potential for a leak exists.
5. Head-to-Head Comparison: Risk vs. Convenience
Let's look at the trade-offs objectively.
| Feature | Pass-Through Kit (Block-Off) | Full Removal Kit (Delete) |
| Coolant Leak Risk | Moderate/High: The cooler remains filled with fluid and can still fail internally. | Zero: The cooler is physically removed. It cannot leak if it isn't there. |
| Engine Bay Space | Cluttered: The bulky cooler still blocks access to the turbo and fuel lines. | Clean: Opens up the engine valley, making future repairs significantly easier. |
| Installation Time | Fast: 2-3 hours. Less disassembly required. | Slow: 4-6 hours. Requires removing intake components and the cooler itself. |
| Visual Stealth | High: Looks stock to an untrained eye. | Low: The modification is obvious immediately upon popping the hood. |
6. Which Is Safer — And Why
Based on mechanical principles, the Full Removal Kit is unequivocally the safer option for the longevity of the engine.
The Logic:
A Pass-Through kit leaves a potential failure point (the cooler) attached to your engine. It is a "dormant threat."
A Full Removal kit eliminates the failure point entirely. By re-routing coolant through a simple, silicone or metal hose, you remove the possibility of an internal cooler failure causing hydro-lock or coolant consumption.
7. Who Might Still Choose Pass-Through?
Despite the risks, the Pass-Through method isn't without merit for specific users:
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"Stealth" Requirements: Owners who need the engine to appear visually stock for quick visual checks (where permitted).
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Budget/Time Constraints: Owners who need a quick fix for a clogged valve and don't have the time or labor budget to strip the top of the engine.
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Lease/Resale: Owners who plan to return the truck to stock shortly (it is much easier to reverse a blocker plate than a full delete).
8. Final Recommendation & Solution
For the 2015 Ford F-350 owner who prioritizes reliability above all else, the answer is clear. Do not leave a useless, water-filled component sitting on top of your engine waiting to fail.
If you are going to delete the system, delete the risk.
The Professional Choice: Full Removal
We recommend a comprehensive Full Removal Kit that includes a high-quality coolant re-route hose and precision-machined block-off plates. This ensures your 6.7L Powerstroke runs cooler, cleaner, and free from the threat of internal leaks.
Ready to bulletproof your cooling system?
👉 [Shop 2015 6.7L Powerstroke Full EGR Removal Kits]
Eliminate the cooler, clear the engine valley, and drive with total peace of mind.
1) Improved Fuel Economy and Engine Longevity; 2) Reduced Engine Temperature; 3) Helps Save Money.
Upgrade Your 2015 6.7 Powerstroke Today