So you’ve gone ahead and removed the catalytic converter on your four wheeled lawn mower Honda Civic and installed a straight pipe in its place. Now your car is that much louder and sharts directly into the atmosphere with no discretion. Removing your catalytic converter or whatever emissions control you have on your cars exhaust system is illegal in most of the developed world for a good reason. The animals and the people around you like to breathe knowing they won’t get lung cancer every time they inhale (smokers, this is also why you’re uncool.) If you look at photos of some of the worlds major cities before emissions controls were introduced, you’ll see why they are so important in a nutshell.