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Diesel Particulate Filters (DPFs) such as the Continuously Regenerating Technology (CRT®) particulate filters are known to be highly effective in reducing PM emissions from diesel engines. Passive DPFs such as the CRT filter operate by collecting soot in the filter and subsequently oxidizing this soot in the presence of NO2 generated by an upstream Diesel Oxidation Catalyst (DOC). Both the NO2 generation and subsequent soot oxidation reactions require a certain minimum exhaust temperature. In addition, the engine out NOx to PM ratio is also critical for continuous and successful regeneration of the filter. However, these criteria may not always be met, particularly on low temperature applications such as refuse vehicles and newer low NOx (2.5 g/bhp-hr NOx) engines. This paper discusses the development of an actively regenerating diesel particulate filter (ACR-DPF) system for retrofit applications on heavy duty diesel vehicles.