Quote:
Originally Posted by tis
I still don't understand how if a boat passed once it can be tested again and not pass. They didn't change the decibel level. Unless someone fooled around with their boat, why would it change?
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You answered your own question. Performance boats/cars/motorcycles are rarely not tinkered with to try and extract more performance from them. One of the easiest ways to extract more performance from an engine is to relieve back pressure in the exhaust system. You can do that in three ways, a really big muffler that keeps the noise down, but takes up a lot of space, looks ugly and costs a lot of money, a smaller muffler that trades higher flow for less noise reduction, or a straight through pipe that offers the best flow for the least amount of money and the least noise reduction. Swapping a muffler for a straight pipe can be a 10 minute job, so passing a test once can mean nothing an hour later...
The easiest solution is to keep the boat/car/motorcycle quiet enough to not attract attention. For some, the attention is the sole reason for the loud exhaust.