Answer: Again, your vehicle’s exhaust system is in charge of converting your engine’s harmful emissions. But, if all of the engine’s emissions aren’t making their way to the catalytic converter, your vehicle will be leaking these harmful substances, which can pose a threat to pedestrians and your passengers. One cause of leaks can be your exhaust down pipe. If that is the case, it will be necessary to have it replaced. Also, if you have a damaged down pipe that is leaking emissions, your vehicle will not be able to pass safety and emissions tests.