A number of possible reasons. There could be damage to your tire rims. Your tires could require balancing. Why would you check the exhaust system if the vibration is coming from the front?
Exhaust gasses are escaping through a hole or rotted section of exhaust system
No.
yes, A vibration with a frequency high enough to cause itching
There are a number of forces that could cause vibration in a ship. Friction for example is a force known to cause vibration.
brake caliber
Could be that the rotors are "out of round" and pulsate Could be a malfunction in the ABS system
Normally the exhaust
poisonous exhaust gases to enter the car and overheating the underside cars' components
Exhaust vibration or loose mount, bad bearing on 1 of the accessories, loose belt squeal, if it's ticking-valvetrain with low oil.
what is bad exhaust system?
No, it will not stand up to the heat of the exhaust gasses and will work harden and crack due to vibration in operation.