Due to the core availability of this product, this product requires an additional $100.00 per injector core charge to be paid prior to order fulfillment. This core charge is fully refundable if cores are returned to our facility no more than 60 days after your order is received. If you do not wish to pay to core charge, you can send your cores to us prior to order fulfillment. Maximize the power and performance of your 6.7L Cummins engine with Alliant Power Reman CR Injector and Connection Tubes. Designed to meet or exceed OEM specifications, these injectors and tubes are completely rebuilt and recalibrated for optimal fuel delivery and engine performance.