Straight-through, or flow-through, mufflers have perforated baffles and packing material that provides a conservative level of sound absorption while still keeping sound output moderately loud. Glasspack mufflers perform similar to resonators due to their design and lack of sound-absorbing packing material, so they tend to be louder and higher pitched. For compression-ignition (i.e., diesel) engines, the most commonly used catalytic converter is the diesel oxidation catalyst (DOC). This catalyst converts particulate matter (PM), hydrocarbons, and carbon monoxide to carbon dioxide and water. These converters often operate at 90 percent efficiency, virtually eliminating diesel odor and helping reduce visible particulates. These catalysts are ineffective for NOx, so NOx emissions from diesel engines are controlled by exhaust gas recirculation (EGR).
Make sure your Subaru, Nissan, Honda, or toyota 22r header is outfitted with a top notch exhaust system from Racing Exhaust System. Some are ideal for normal vehicles while others are better for high-performance engines. Products manufactured by REMUS without (EC-)approval are only eligible for usage at motor sport events or tests within the meaning of KFG 1967.
If you've got questions about cat-back exhaust systems, pipe diameters, muffler type, or anything else, talk with our product specialists. All 1995 model year vehicles, and all 1992 model year or earlier vehicles. All model year vehicles that were manufactured with EPA or Federal emissions certification. Exhaust gases from the cylinders are collected in the exhaust system to prevent harmful fumes from entering the vehicle.
Federal Catalytic Converters are not legal for sale, installation or use in the state of California. It should be noted that a split system will often provide an aggressive noise increase, and some designs will split the two pipes to opposite sides of the vehicle. If you are looking to save a little money but still get most of the benefits of a cat back exhaust system, however, aluminized steel may be the way to go. Made from traditional steel that’s been coated on all sides with aluminum-silicon alloy, these systems are very strong thanks to the metallurgical bond which still provides a level of corrosion resistance. While the aluminum coating reflects heat well, the steel can corrode if the aluminum layer is chipped or scraped off. Most cat-back systems will come in either an aluminized or stainless steel version.
By running pipes from the catalytic converter to the muffler and from the muffler to the exhaust tip, cat back exhaust systems improve exhaust gas flow, providing small performance boosts. However, your performance gains may be limited if your catalytic converter restricts gas flow, as a catback exhaust system is installed ‘downstream’ of the converter. Header-back systems are increasingly rare, namely because of modern emissions systems. Since removing your vehicle’s factory emissions components is highly illegal, the previous two options are more common. However, 240sx header-back systems are still available for some older, pre-emissions applications. In these cases, header-back systems offer more performance and volume than cat-back or axle-back systems