(Please read : What is a Reman DPF first) The aftermarket units are made with all new materials, substrates, and catalyst coatings. They have warranty coverage ranging from 2yr / Lifetime and 200,000 miles / Unlimited depending on the manufacturer. The efficiency of the catalyst coating can have massive impacts on the service life and function of a DPF, so with a new unit you can also rest assured on your starting point when put into service. The new aftermarket DPF systems are also free of any core charges or exchange implications, sometimes allowing the customer to start a backup cleaning rotation depending on the condition of the removed filter.