Im not sure about that mine does it in the same rpm range every time. I was paying close attention today after reading your post. Sometimes my vacuum gauge was around 10 and it was still doing it. I have ran 3 different tunes in this car and have had issues in the same rpm range. I had a Bama...
Ita personal preference so I'm not sure how much the sound will bother you. It bothered me at first now I don't even think about it. It's something you just get used to. Now I actually like how it sounds. Also the sound has changed since I first installed the procharger. It was much louder when...
You can definitely hear it with the hood closed. I've had more than one person ask me what's wrong with the car. Lol. Most people think it sounds bad ass but there are some that have no clue.
The best description I can give is it sounds like a ball bearing moving around in the procharger without the helical gear. I guess u describe it well with marbles in a can. This is only at idle. If you don't want that get the helical gear.