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Recently, there has been an upsurge in the quest for reducing emission from 2-wheelers with the introduction of Euro III emission regulations in Europe and similar regulations worldwide. While many OEMs have shifted from 2-stroke to 4-stroke, they are mostly still open loop carbureted or in some cases fuel injected. The combination of cold start fuel enrichment and high exhaust flow rates has posed challenge on the catalyst functionality for controlling the emissions of THC, CO and NOx simultaneously. This paper describes the success story of some unique, cost effective catalyst solutions for regulating THC, CO pollutants from two wheelers. This paper mainly deals with some case studies on the catalyst performance testing in the dynamic test cell as well in the actual vehicle. Several factors contributing to the catalyst performance in the cold start, ECE and EUDC mode are discussed.