Mazda to Exhibit first Japanese Car with SCR System at Frankfurt Motor Show.The Mazda stand at next month’s Frankfurt Motor Show (IAA) will exhibit the first Japanese passenger car to have a diesel engine mated to a Selective Catalytic Reduction (SCR) system. This technology will be offered exclusively to European customers in the new diesel facelift version of the CX-7, Mazda’s sports crossover SUV, which will go on sale in October this year.