Cummins X15 EGR Cooler Bypass Kit

Cummins X15 / ISX EGR Cooler Bypass Kit – Complete Solution for Maximum Reliability

Upgrade your Cummins ISX and X15 engine with this high-quality EGR Cooler Bypass Kit, the ultimate solution for eliminating the failure-prone factory EGR cooler. Precision-engineered to enhance durability and efficiency, this ISX EGR Bypass system prevents coolant leaks, reduces heat buildup, and keeps your engine running stronger for the long haul.

Key Benefits

✅ Premium Durability: Built from high-grade materials for long-term strength and reliability in demanding environments.
✅ Leak-Proof Performance: Each EGR Bypass component is precision-fitted to ensure a secure, leak-free connection.
✅ Improved Engine Efficiency: Reduces heat and flow restrictions, allowing your Cummins ISX to perform at its best.
✅ Direct-Fit Installation: Designed as a drop-in ISX Bypass replacement—no modifications or special tools required.
✅ OEM Compatibility: Fully compatible with Cummins part numbers 4367122 and 5575183 for seamless integration.

Kit Contents

Everything you need for a complete, professional installation is included:

• (1) Coolant Bypass Tube, Front and Rear — #4367122 & #5575183

• (1) Turbo Coolant Return Line

• (1) Coolant Vent Tube (Bypass to Thermostat Housing)

• (1) 14mm Metric Plug

• (1) Manifold J-Seal

• (4) Turbo Studs

• (4) Turbo Nuts

• (1) Intake Manifold Block-Off Plate

• (1) Turbo Mount Gasket

• (1) Turbo Oil Drain Gasket

• (1) 12mm Metric Plug

• (4) Exhaust Manifold Outer Gaskets

• (1) Exhaust Manifold Center Gasket

• (1) Exhaust Manifold Elbow with Port for Exhaust Gas Pressure Sensing Line

• (1) Fitting: Turbo Coolant Return to Thermostat Housing

• (2) Unions for Vent Tube

Why Choose an EGR Cooler Bypass?

The Cummins ISX EGR system is known for frequent failures such as coolant leaks, clogging, and overheating. This EGR Cooler Bypass Kit eliminates those weak points—improving reliability, reducing maintenance costs, and optimizing engine performance.

Whether you’re maintaining a heavy-duty fleet or keeping your single rig running cool, this ISX EGR Bypass delivers the performance and dependability your engine deserves.

Keep your Cummins X15 or ISX running cooler, cleaner, and more efficient—mile after mile.