Back pressure is the plague of an inefficient exhaust system. When spent gases cannot flow freely through the pipes because of restrictions, they cause gaseous gridlock in your engine that goes all the way up to the cylinder. Since the gases cannot escape at the proper velocity, your engine has to work harder without yielding greater power. In effect, you lose horsepower, torque and fuel economy.
An acronym for the California Air Resource Board, which is California's regulatory agency tasked to set the state's acceptable automotive emissions levels. Most performance exhaust systems are built to meet CARB's strict requirements, and some premium manufacturers, like JBA, weld a CARB acceptance number directly onto their products to guarantees their legality.
A colorless, odorless, highly toxic gas that is formed by the incomplete combustion of carbon, especially fossil fuel combustion. It is a key ingredient in smog formation.
When applied to a performance exhaust, this terms means that the system will hook up after your catalytic converter and run all the way back to your tailpipe. By leaving the catalytic converter connected, cat back exhaust systems stay street legal.
A catalytic converter reduces the amount of pollutants in your vehicle's exhaust by causing a chemical reaction that transforms once harmful particles into more benign elements. It looks like a muffler, and is filled with platinum and palladium infused ceramics, the catalyst for the transformation.
Burning of the air/fuel mixture in the combustion chamber that generates the energy necessary to run your engine. The mini-explosion in a combustion engine is triggered by a spark from the spark plugs that's added to the compressed air/fuel mixture at the top of the piston cycle. Timing and a proper air/fuel ratio are critical to the power gained during combustion.
Cylinders are the core of your engine, and they are the location where combustion occurs. There are a number of key components that work together inside each cylinder to create the power that propels your vehicle down the road. At the top, there are intake valves that feed fuel and oxygen into the chamber, and exhaust valves that vent waste gases from the cylinder. At the base of the cylinder is a piston that is being driven up and down inside by the crankshaft, which in turn is spinning power out to the transmission and then to your tires.
A straight line segment that passes through the center of a circle or sphere and connects two opposite points. Mathematically, the diameter of a circle is expressed as 2r, with "r" representing the radius of the circle or sphere.
The vacuum created by the flow of exhaust through the exhaust manifold. When a system is tuned properly, engine scavenging can greatly increase efficiency and horsepower because it helps pull exhaust out of the other cylinders.
An organic compound that contains only hydrogen and carbon. In vehicle emissions, these are usually vapors created from incomplete combustion or from the vaporization of liquid gasoline. Emissions of hydrocarbons contribute to ground level ozone.
There are two ways of determining the age of your vehicle: the year it is built in (build-year) and the year it is sold as (make-year). Auto manufacturers need to have plenty of vehicles in stock before they start selling them, so they begin production about a year ahead of the actual release date. In other words, most 2005 models were actually made in 2004. However, the DMV dates the age of a vehicle by the make-year, which is the year the car, truck or SUV is sold as. This distinction is important because many states offer a smog certification waiver to automobiles that are 30 make-years old or older, not just 30 years from the build date. Moreover, when you are choosing parts, make sure you go by the make-year of your vehicle rather than the year it was built, or that new set of performance pipes may not quite fit. If you are unsure about your vehicle's year, check your registration, which should be in your glove box.