Cummins QSX 15 | DEF Header | 4352100C91
Brand-new aftermarket DEF header, no core needed. Direct OEM replacement for 4352100C91 & more. Built to OEM specs and backed by manufacturer warranty.
DEF Header | 4352100C91
Restore your truck’s emissions system with this brand-new aftermarket DEF header, a direct-fit replacement for OEM part number 4352100C91. No core charge. No hassle. Built to meet stringent OEM standards, this DEF header offers reliable performance and seamless compatibility across a wide range of diesel applications.
Designed for Navistar and Cummins QSX engines, this header replaces multiple OEM references including 2523591C91, 4140918C91, 4097728C91, and 4254210C91. Whether you’re servicing a fleet or a single truck, this DEF header ensures accurate DEF level and temperature readings to prevent fault codes and maintain full emissions compliance.
Constructed with high-quality materials for durability and resistance to urea corrosion, this header installs easily with OEM-style connectors—no modifications required. It’s the ideal solution for truck shops, fleet managers, and owner-operators looking to reduce downtime and avoid dealership markups.
Backed by a manufacturer warranty, this replacement DEF header delivers long-term value and performance you can trust.
Upgrade today and keep your truck running clean, compliant, and on the road with a cost-effective, emissions-ready DEF header replacement—no core required, from American Radiator.
DEF Header Features:
Designed For:
Manufacturer Warranty
DuraWRX provides a manufacturer's warranty on its DEF-related products for up to 2 years/40,000 miles/1,200 hours (whichever occurs first). This warranty covers any defects in materials or workmanship. To be eligible for a claim, the end user must register their product purchase on the DuraWRX site. To file a claim, customers must contact DuraWRX to receive a return shipping label. Once the product is returned and the claim is approved, DuraWRX will issue either a refund or a credit.
DEF Header Specs
Please confirm your OEM or Aftermarket number matches before ordering.
4352100C91
2523591C91
4140918C91
4097728C91
4254210C91
2517604C1
4086046C91
2515987C1
2515986C1
2510966C3
2510966C1
Shipping & Returns
Why Buy From American Radiator?
Trust American Radiator, your reliable source for quality cooling solutions since 2001. With roots in the industry dating back to the 1970s, our team brings decades of experience delivering high-performance radiators, charge air coolers, and DPF systems at competitive prices.
We work directly with trusted domestic and international manufacturers that supply OEM-grade components, ensuring every product meets or exceeds original equipment standards. Whether you need a heavy-duty truck radiator or a replacement for your DEF Header, we’re committed to providing durable, cost-effective solutions that perform.
Have questions? Contact our experienced inside sales team at 888-483-5763 for expert guidance and fast, friendly support.
| Part Number | SKU | 253591 |
|---|---|
| OEM | Aftermarket Numbers | 4352100C91 2523591C91 4140918C91 4097728C91 4254210C91 2517604C1 4086046C91 2515987C1 2515986C1 2510966C3 2510966C1 ASP9082321623 ASP-908-2321-623 |