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Producing on-board the hydrogen that is to be used as supplementary fuel by exhaust gas reforming of gasoline shows encouraging results. Extensive research has been done at the University of Birmingham towards on board generation of hydrogen-rich gaseous fuel. Exhaust gas reforming which utilizes water vapor and enthalpy from the hot engine exhaust gas was applied using a compact system of a fuel reformer reactor integrated with the three way catalytic converter (TWC). Such system can be fitted in the limited space close to the engine. The device has been designed and built in concentric shape with the catalytic converter as a core and the reformer in an annular shape outside, to best utilize the waste heat from the catalytic converter. It requires very little extra space beyond the baseline catalytic converter.