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The conventional evaluation of automotive catalysts has been carried out based on end-pipe measurement whereby the gas at the tailpipe of an automobile or the outlet of the bench reactor is monitored by using various analytical techniques such as Fourier-transform infrared spectroscopy (FTIR), mass spectrometry (MS), and gas chromatography (GC). However, this approach only provides overall gas concentrations at the exit flow of a monolith catalyst. Thereby, there is a deficiency of information on intra-catalyst chemistry. To obtain deeper insights on the design of an automotive catalyst, an emission breakdown analysis is critical. In this way, a comprehensive understanding of continuous processes along the catalyst length can be achieved. Here, we introduce the High Throughput Vehicle Test (HTVT), which is an analysis technology method for simultaneous emission observations at different catalyst positions in the vehicle.