This is achieved by burning off the excess hydrocarbons which result from the extra-rich mixture required for a cold start. Slightly lean of stoichiometric, the exhaust gases from the engine contain excess oxygen, the production of NOx by the engine increases, and the efficiency of the catalyst at reducing NOx falls off rapidly. However, the conversion of HC and CO is very efficient due to the available oxygen, oxidizing to H2O and CO2. However, the efficiency of the catalyst at reducing NOx is good, and the production of NOx by the engine decreases.

Let’s look at the top ten reasons why a cat back exhaust system may be right for you. While a cat-back exhaust system includes all components from the catalytic converter to the exhaust tips, an axle-back system only replaces parts from the rear axle to the tips. Axle-back systems are generally easier to install and less expensive but offer more limited performance improvements and sound changes compared to cat-back systems. All our performance exhaust systems are designed with you in mind, and we cater to an ever-expanding range of vehicles. We believe in continuous evolution, and our research &amp