The exhaust tubing is kinked.

Repair or replace the damaged tubing.

The muffler is restricted.

1. Remove the muffler.
2. Inspect the muffler for a restriction.
3. Replace the muffler if the condition of the muffler is doubtful. Refer to Muffler Replacement .

The tail pipe is obstructed.

1. Remove the obstruction.
2. If the end of the tail pipe is crimped, straighten the outlet. Refer to Muffler Replacement .

The inner layer of the double layer pipe is separating.

Replace the pipe. Refer to Exhaust Pipe Replacement .