yesterday i removed my OEM muffler to inpsect for any leaks/cracks and trying to pinpoint an ongoing noise while driving the car. it looked fine no cracks or holes in it.
still when i drive the car over 60 the noise level inside the car is unbearable. i am thinking maybe the differential is dying or what should i be looking at. if the exhaust manifold is out how can i tell?
any help is greatly appreciated.