I was stopped at 1:00 pm this afternoon by MAPSA for a spot smoke belching test. My ride which is a 98 diesel Besta with almost 85,000 km to its odometer failed the test. I told the officer that I just had the fuel injection system overhauled and calibrated during my 80,000 km PMS and he said that I should also have had the muffler flushed with soap and water. Anyway, I pleaded and he relented and did not take my front plate and license. So lucky me and my question now is where do I bring my van to have its muffler or exhaust system flushed with soap and water? Is this procedure safe?? will it save me next time from spot checks??? please advise. Thanks!!!