I have a very faint buzzing noise that can be heard inside the car. It only occurs when you are driving - not while sitting stationary. It sounds almost electrical in nature, like a speaker making an ever-so-faint buzz noise. They replaced the front-passenger speaker to no avail. It sounds...

I just bought a 2017 Mazda3 hatchback, curious on what websites are the best for ordering aftermarket performance parts? Trustworthy websites