Two types of pipe connections are used on most exhaust systems, they are: the ball joint (to allow angular movement for alignment purposes) and the slip joint. Gaskets are used only with the ball joint type connections.
The system is supported by free hanging rubber mountings which permit some movement of the exhaust system but do not allow the transfer of noise and vibration into the passenger compartment. Any noise vibrations or rattles in the exhaust system are usually caused by misalignment of the parts.
Before performing any operation on the exhaust system, be sure to allow it to cool.
Whenever working on the exhaust system always keep the following in mind:
Check the complete exhaust system for open seams, holes loose connections, or other deterioration which could permit exhaust fumes to seep into the passenger compartment.
The exhaust system is usually supported by free-hanging rubber mountings which permit some movement of the exhaust system, but does not permit transfer of noise and vibration into the passenger compartment. Do not replace the rubber mounts with solid ones.
Before removing any component of the exhaust system, ALWAYS squirt a liquid rust dissolving agent onto the fasteners for ease of removal. A lot of knuckle skin will be saved by following this rule. It may even be wise to spray the fasteners and allow them to sit overnight.
Allow the exhaust system to cool sufficiently before spraying a solvent exhaust fasteners. Some solvents are highly flammable and could ignite when sprayed on hot exhaust components.
Annoying rattles and noise vibrations in the exhaust system are usually caused by misalignment of the parts. When aligning the system, leave all bolts and nuts loose until all parts are properly aligned, then tighten, working from front to rear.