Description

The 21D303 is a complete all-in-one stock injector replacement pack for the 2007.5-2012 6.7L Cummins — six remanufactured stock injectors plus six new Bosch connecting tubes in one box. When your 6.7L Cummins starts losing power, smoking at idle, throwing balance-rate codes, or burning fuel in the regen cycle, this is the drop-in fix that gets the entire injector job done in a single order.

Each injector starts as a genuine Bosch core. Industrial Injection fully disassembles and rebuilds it with new Bosch internals — nozzles, valves, and hardware — not just refurbished old parts. Each finished injector is balanced to a tighter flow tolerance than factory OEM and run through a 7-point test on a Bosch OEM stand: resistance check, system leak test, purge, idle-speed flow, mid-load flow, full-load flow, and static back leak. Owners report smoother idle and more consistent fuel trim after install.

The six Bosch connecting tubes ship with the kit because they're not optional — old connecting tubes are the #1 cause of new-injector contamination on the 6.7L Common Rail. Industrial Injection refuses warranty claims on injectors installed with old tubes for this reason.

Features

• Complete Set — 6 Reman Stock Injectors + 6 Bosch Connecting Tubes
• Direct OE Replacement for 2007.5-2012 6.7L Cummins Common Rail
• Brand-New Bosch Internals — Nozzles, Valves, Hardware All New
• Balanced Tighter Than Factory OEM Tolerance
• Factory OEM 7-Point Test Stand Verified Per Injector
• Includes Copper Crush Washers + O-Rings for Install
• Stock Calibration — No Tune Required
• $870 Core Charge — Fully Refundable Within 45 Days of Return
• 2-Year Unlimited Mileage Warranty

Notes

• The included connecting tubes are not optional — old tubes contaminate new injectors at startup and void Industrial Injection's warranty.
• Plan on replacing the copper crush washers and O-rings (both included) — one-time-use parts.
• Cores must be returned within 45 days for the $870 core charge to be refunded.