A performance enhancement for specific General Motors vehicles produced from 1978 to 1988, this modification involves the installation of a two-pipe configuration for the evacuation of exhaust gases from the engine. The original equipment often featured a single exhaust pipe; this alternative arrangement provides a separate pathway for each bank of cylinders in a V-configured engine. For instance, a Chevrolet Malibu or a Buick Regal, both built on the specified chassis, could be retrofitted with this type of after-market setup.
The advantages of such a system typically include improved engine breathing, leading to potential horsepower and torque gains. Separating the exhaust flow from each cylinder bank can reduce backpressure and increase scavenging efficiency. Furthermore, an altered sound profile, often perceived as more aggressive and desirable, is a common byproduct. Historically, modifications like these became popular as owners sought to enhance the performance of their vehicles beyond factory specifications.
