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Flowmaster’s Pro Series is intended for high-output applications that need substantial exhaust capacity without giving up durability or sound control. The line is specifically positioned for high-horsepower vehicles, including diesel trucks, RVs, performance trucks, and other large-displacement combinations where exhaust volume can exceed what a smaller conventional muffler handles comfortably. Flowmaster uses a durable, fully welded 16-gauge stainless-steel case with 409 stainless internal construction, giving the Pro Series the strength needed for demanding street, towing, and performance use. The design is race proven and is rated with a moderate sound level, providing a noticeable performance tone while remaining more controlled than Flowmaster’s most aggressive race-oriented mufflers. The larger round-body format also makes the Pro Series a natural fit for custom exhaust fabrication using larger tubing diameters. Depending on the part number, the outlet can be configured for a standard straight connection or a turndown-style arrangement, giving builders flexibility when routing the system. For a diesel pickup, motorhome, tow vehicle, high-horsepower street build, or custom project using large-diameter exhaust tubing, the Pro Series provides a durable Flowmaster solution focused on flow capacity, structural strength, and a strong but manageable exhaust note. It is especially useful when a smaller muffler would become the limiting factor in a large-diameter exhaust system.
