For a number of reasons, exhaust system work can be the most dangerous type of work you can do on your car. Always observe the following precautions:
A number of special exhaust system tools can be rented from auto supply houses or local stores that rent special equipment. A common one is a tail pipe expander, designed to enable you to join pipes of identical diameter.
The exhaust system of Toyota Celica and Supra consists of several pieces. At the front of the vehicle, the first section of pipe connects the exhaust manifold to the catalytic converter. The in-line 6-cylinder uses a Y-pipe to connect the two outputs from the exhaust manifold. The catalytic converter is a sealed, non-serviceable unit which can be easily unbolted from the system and replaced if necessary.
The exhaust system is attached to the body by several hooks and flexible rubber hangers; these hangers absorb exhaust vibrations and isolate the system from the body of the car. A series of metal heat shields runs along the exhaust piping, protecting the underbody from excess heat.
When inspecting or replacing exhaust system parts, make sure there is adequate clearance from all points on the body to avoid possible overheating of the floorpan. Check the complete system for broken damaged, missing or poorly positioned parts. Rattles and vibrations in the exhaust system are usually caused by misalignment of parts. When aligning the system, leave all the nuts and bolts loose until everything is in its proper place, then tighten the hardware working from the front to the rear. Remember that what appears to be proper clearance during repair may change as the truck moves down the road. The motion of the engine, body and suspension must be considered when replacing parts.