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Why drilled hole in the muffler.
Surely, some drivers who drive a car is not the first day and at least once crawled under it, You may have noticed that some of their more experienced comrades for something drilled into a small muffler hole. Motorists do it right away, with the old exhaust system is replaced by a new one. And no, the hole in the pipe - it does not feature factory.
Water availability problem in the muffler has two diametrically opposed points of view. Consider both.
Opinion "for"
You can do at this point.
Strictly speaking, a hole is made in the rear muffler bank. For what? In fact, everything is very simple. This is done to protect against corrosion. Needless to say that the later the muffler will "rot", the longer it will serve faithfully. Of course, a beginner asks how to do some small hole can protect against such destructive phenomena car exhaust system.
All the matter in the condensate or weep. Condensate is released when the water vapor from the vehicle exhaust gases are deposited on the walls of the muffler. Condensate flows mainly after the machine for a long time stood idle.
If you do not make a hole, condensation will collect in the muffler bank. From there, it will not go away without help. In winter, condensation will also freeze after each trip, that will only speed up the already disastrous process.
Opinion "AGAINST"
Since the engine is operating fuel-air mixture is formed at the exhaust steam. In the cold season, this steam can really be condensed inside the muffler in the form of moisture. For the old Soviet and Russian vehicles, silencers which were made of ordinary steel, this situation could be very critical. Just 3-4 years muffler could be damaged. However, mufflers made of stainless steel are much longer.
Drilled a hole in the muffler likely will gradually burn through, and exhaust all the same will become worthless. To get rid of the water in the muffler, it can be dried again in a few weeks. It is enough to watch the trip on the road, occasionally to disperse the car engine up to 5-6 thousand turns. During this trip the silencer warms up, and all the water out of it evaporates.
Continuing the theme an easy way to open a padlock with a key and not only.
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A source: https://novate.ru/blogs/180818/47491/