in the past week, I notice that my car began to make some noise when I accelerated the car. Then when I turn on the car, if the car make some unusual noise, I can see white steam coming out of back pipe (not every time). I did search online and found it's like exhaust leaking problem. Then today, when I try to turn it on, it just make some noise like gas leaking. I made 2 youtube clips for reference. Any suggestion?
1st clip: from driver side
https://www.youtube.com/watch?v=UOHmZarxgAI
2nd clip: from front of the car
https://www.youtube.com/watch?v=b4OjHxbAGlI