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In the American Thunder kit, they use the 40 series Classic two chamber .... They are a very aggressive sound. There is definitely a drone at low speeds 1200-1500 cruise. It's kinda hard to tell by a video, but the kit I have seems to be louder and a lower tone. My normal take off seems more like his hard take offs, but with more of a rumble. When cruising you can definitely feel the drone in your butt, but it's a good thing .....
If you don't like the loudness their 50 Series has more baffles in them for drone and harshness .... Kinda like the old Hush Thrush mufflers ...
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