See also:

Three-way catalytic converter
Keep your engine properly tuned. Certain engine malfunctions, particularly involving the electrical, fuel or distributor ignition systems, may cause unusually high threeway catalytic converte ...

Exterior
I love retro design as much as the next person, but I tend to appreciate it more in inexpensive things like sneakers, T-shirts or coffee tables that I can get rid of when my taste changes. But $49 ...

Disposing of old batteries
Worn out batteries should be disposed of in an environmentally responsible manner. ...