I got my ears blasted by a lifted diesel truck that clearly did something to kneecap their muffler that was...excellerating from stopped in a bank branch parking lot. It was seriously louder than most semis, and significantly louder than most tractors (my father in law restores antique tractors, so I've ridden on several tractors) and could compete with a diesel train with 3 engines lashed together hauling 2 miles of freight up a grade