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Experimental results are presented for a technique of converting Diesel fuel to a gas stream rich in carbon monoxide and hydrogen suitable for Lean NOx Trap (LNT) regeneration. The device is relatively simple and relies upon a premixed, rich flame to generate gas with 4.5% H2 and 10% CO. The device, referred to as a flame reformer, offers a number of advantages over other methods of reductant generation for bypass regeneration LNT systems. Specifically, the device offers rapid dynamic response, potential lower cost, with a similar level of performance to other proposed methods of reductant generation.