Listen to this short video, and let me know what you think. The sound is only there when the engine is under any load. If I am very careful I can raise through the RPM without the noise, but give it a little bit more gas and there it is. It sounds kind of like an exhaust leak, but I'm not sure.
https://youtu.be/ozeB7NNj6dE
Listen closely right at 0:12-0:15. That is me accelerating for 3 seconds, and that sound like a rain stick is my engine.
https://youtu.be/ozeB7NNj6dE
Listen closely right at 0:12-0:15. That is me accelerating for 3 seconds, and that sound like a rain stick is my engine.