The sound is similar to a Flowmaster without the drone during cruise. At idle, the exhaust note is throaty, but not overly loud. It's when you put your foot into it where the Spintechs really shine. At wide open throttle, the sound is extremely strong (aggressively speaking, not loudness), and makes the engine sound as if it's turning 1000 rpm higher than actual. In the car, the exhaust tone is a bit loud, as the mufflers sit right under the rear seats, but nothing that an ordinary muscle car enthusiast wouldn't enjoy.
Overall, your results will vary depending on your camshaft. I recently made the switch from a very small hydraulic cam to an aggressive solid with a large exhaust duration. Following the switch, the exhaust note at idle was slightly louder, but not much. You should be able to find some YouTube video clips of various cars using the Spintechs. If you like the sound of a Flowmaster, you'll love the sound of a Spintech.
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