The fastest and loudest cars, such as the record-breaking Venom GT, are often custom builds with enhanced exhaust systems, according to the car's official website. To order a Venom GT, for example, the buyer would need to contact the manufacturer directly, rather than visit a car lot.
There are several different cars that have broken the world record for speed including the Venom GT, Bugatti Veyron Super Sport, SSC Ultimate Aero and the 9ff GT9-R, according to to Cherise LaPine. To make these cars louder, one would have to replace parts of the exhaust system. Especially designed resonator can also be used in place of a muffler to increase performance and sound, explains Summit Racing Equipment.