Trash the cat. . Take a tubing cutter or saw around the pipe both in front and behind the cat and replace with a new peice of flared end, straight pipe made up at a local muffler shop. Cost you about $20. Sounds great, Runs cooler and should get better milage. After you have done this, consider doing the same to the muffler, but make sure it exits out the back of the truck. Fairly noisy.