Three days ago bought a 2000 Maxima GLE with 81,000 miles and when I first got it the car was running good and silent. The next morning when I turn on the car the engine was louder than the night before. I noticed that it makes this noise at cold starts. I added a video of the car's start up, noise when car is warm and shifted to drive, and finally the sound of the engine from outside. is this noise normal. I want the engine to always sound the same as when I shift to drive.



Also, when I get the car moving I heard a slight grinding noise that seems to be coming from the front of the car. Can this be brake or suspension related?