The Car Body Has Abnormal Noise

I am a smoker, and I always make my car black and noisy with the windows open, so when I changed my car, I deliberately chose a model with a sunroof. However, when the sunroof is opened, there will always be abnormal noises. Some people say that it is a collision sound between the exhaust pipe and the car body. When the road condition is relatively bumpy, abnormal noise will also be generated in the trunk.