The exhaust is held in place by several rubber hangers. On the V6 Tacoma, there are two hangers on either side of the y-pipe, or mid-pipe. There is a single hanger at the front of the muffler, and two hangers at the rear of the muffler. The final hanger is located near the end of the tailpipe.
On the 4-cylinder Tacoma, the first hanger is in the mid-pipe between the two catalytic converters. There is one hanger at the front of the muffler, and two attached to the rear. The last hanger is near the end of the tailpipe.
The rubber hangers on these systems are prone to failure. Rubber, when exposed to the elements, has a tendency to deteriorate. To keep your system in top shape, you should periodically check the hangers. To do this is simple; jack up and support the vehicle. Crawl under the vehicle, and visually inspect the hangers.
Be on the lookout for broken or missing hangers. Replace these immediately. Then, shake the exhaust side to side and up and down in the area of each hanger.
If any part of the exhaust system contacts other vehicle components, or moves excessively, replace the hanger. The metal portions of the hangers can also be damaged or broken by hitting obstacles off-road.
Again, jack up and support the vehicle. Examine all the metal hangers going from the exhaust system to the rubber hangers. Repair may be as simple as unbending the metal hangers.
Any hangers that are damaged beyond repair should be replaced as soon as possible. You may be able to replace just the hanger, or in some cases, replacement of a whole exhaust system component, (muffler, converter, tailpipe, etc.), may be necessary.