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Flowmaster’s 80 Series is a crossflow muffler designed for applications where both exhaust banks or multiple outlets need to be managed through a single, wide muffler body. Flowmaster identifies the 80 Series as using its original two-chamber design, delivering an aggressive exterior exhaust tone along with noticeable interior resonance. That gives the series the traditional Flowmaster character many enthusiasts want while providing the specialized inlet and outlet layouts required by transverse or crossflow exhaust systems. The broad oval case is commonly used when packaging space favors a muffler mounted across the vehicle rather than lengthwise, making the 80 Series useful for muscle cars, performance coupes, trucks, and custom builds with limited conventional muffler space. Depending on the part number, the series is available in steel or stainless-steel construction, and the fully formed case is intended to provide long-lasting service in performance use. Because the 80 Series is designed around crossflow applications, the exact inlet and outlet configuration is especially important when planning a system; options include dual-in/dual-out and single-in/dual-out layouts. For builders looking for an aggressive Flowmaster sound while working with a transverse muffler location or a multi-pipe exhaust arrangement, the 80 Series combines the company’s classic two-chamber sound with packaging flexibility that a standard inline muffler cannot provide.
