I am thinking I have the same problem. Thought it was injectors making noise under a load/decent amount of throttle due to my edge timing since as the l turn up the programmer it gets louder. But that made no sense because it did it from 1400-1700 RPMs in fourth gear but at the same RPMs in 5th gear....no noise. No matter the load or throttle. So I figure it's fourth gear. It's fine with light throttle or easy driving. But turn up the power and there it is. Not real loud but noticeable to me. Just wondering if anyone has found any fixes to this problem?