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Understanding the chemical reactions taking place in the engine and after-treatment systems is indispensable for minimizing harmful emissions in automotive exhaust gas. Real time gas analyzers for engine exhaust play a vital role for developing mathematical models and evaluating new after-treatment technologies. Gas analyzers using Fourier Transform Infrared Spectroscopy (FTIR) offer the advantage of continuous non-destructive simultaneous multicomponent analysis of a single gas stream. The ability of such analyzers to detect concentration fluctuations in the sample gas depends on a balance between its sample gas replacement rate and data sampling frequency. Increasing the sampling frequency is useful for detecting rapid concentration fluctuations, provided that the sample gas replacement rate is fast enough. This is commonly achieved by increasing the sample flow rate.