just replaced the exhaust (from the catalytic converter all the way back to the muffler), new oil pan, and new ball joints.

when i m driving now i notice a humming sound, have no idea where its coming from. Any ideas?


Also when i m driving, if i shift into first and dont give it enough gas i can feel the exhaust rumble. Can it be that i over tightened the spring bolts? I have a feeling it is that the engine shake (from when u shift into first and dont give it enough gas) its transferring to the muffler cause the spring bolts are to tight and have no mobility. Any input not sure if this is correct.