What are the common symptoms of a motorcycle exhaust system that has a physical leak at the header pipe flange joint?

1. Loud popping or cracking noises during deceleration and a louder, raspy exhaust sound near the engine cylinder.
2. The engine stalling immediately when the clutch is engaged.
3. Black soot depositing on the rear tire and swingarm area only.
4. A drop in engine oil level and high engine coolant temperatures.