EMS is proud to be an American manufacturer of professional quality emissions testing equipment. Located in the Chicago area, EMS has over 30 years experience in the business and has been manufacturing bulletproof exhaust gas test equipment for over 20 years. Over the years, EMS has developed the most heavy-duty and reliable units on the market. We stand behind our products! EMS takes pride in customer service and believes in building strong, personal relationships with customers. In addition to manufacturing successful emissions testing products, EMS has branched into the High Performance Industry. The company has partnered with Norm Brandes of Westech Automotive and Dan Timm of Advanced Engine Concepts, Inc. to bring a high performance engine tuning package to the market. The unique tuning system they have developed includes a 5 gas analyzer, DYNO interface, and dynamic software.