Aftermarket exhaust parts restrictions in the system—can similarly increase performance, though would likely be illegal in areas where tampering with emissions devices is prohibited, particularly when placed in front of the catalytic converters. Aftermarket exhaust parts Aftermarket exhaust parts are intended to replace the factory fitted exhaust components of a car, motorcycle, or other motor vehicle in order to improve the performance, visual appeal, or sound of the vehicle. Generally, performance enhancements are achieved by reducing the back pressure of the factory exhaust system. Frequently a side effect of a free-flowing exhaust system is either a "different" sound, a higher noise level, or
What Car? What Car? What Car? is a long running United Kingdom monthly automobile magazine and website, currently edited by Steve Huntingford and published by Haymarket Consumer Media. First published in 1973, "What Car?" is intended primarily as a magazine for car buyers rather than dedicated enthusiasts. In addition to first drives and group tests of the latest models, it contains an extensive buyer's guide section to help consumers choose the right car for their needs and provides tips on how to get discounts on cars. In 1978, the magazine held its first "Car of the Year Awards", giving advice on the