Probably. The baffles aid in cooling the engine. Without, the engine will probably overheat. IT causes premature wear on all of the parts and can lead to failure.
Not unless your engine was desgined to run with added back pressure. Most motorcycles do not seem to be negatively affected.Just don't get a ticket for the noise.
No,nothing will happen to your motorcycle because baffles are just used to produce new sound and to emit exhaust easily.Removing it will cause the exhaust to clog up.