Bmw Rubbing/knocking
So for context I own a bmw 320i f31. About a month ago I started getting this rubbing noise that sounds like its under the driver's seat mat or just in front. It makes this noise when the car starts up especially on cold start then dies down a little. Also happens when I get on the gas a bit and when turning corners semi sharply. It sounds like a rubbing/knocking noise. I can think of a few things that it could be, but im just looking for some input or insight if anyone has experience or anything they can add. Ill make a list below of what I think it could be.
1: Control arm bushings
2: Ball joints
3: Strut top mount/strut bearing
4: Sway bar links
5: Exhaust rattle/Vibration.
I recently got a varex valved muffler installed about a month ago and thats when it started to get louder and the vibrations felt more violent i guess or more noticeable.