If you ever notice your fuel economy decreases noticeably or a rotten egg smell is coming from your engine and has black smoke? Then you need to clean the catalytic converter right away! Deeply clean your converter with Catalytic Converter Cleaner without removing it! Stop the dreaded service enginelight flashing up on your display, and get better engine performance! This is an absolute money-saver! Thanks to lower maintenance and fuel costs. On top of that, you wont have to shell out the big bucks to change your catalytic converter. LOWER EMISSION LEVELS It can lower your total hydrocarbon emissions by up to 50 percent.