Glass Pack Muffler 2.5in Aluminized Large

The Glass Pack Muffler 2.5in Aluminized Large by MagnaFlow Performance Exhaust is a time-tested silencer engineered for builders and enthusiasts who prioritize aggressive sound character without sacrificing street legality. This 2.5-inch diameter muffler serves as the ideal mid-range solution for classic muscle cars, street rods, and modern performance platforms where engine tone matters as much as flow efficiency.

Glass pack technology—a fiberglass-packed chamber design—has remained a favorite among automotive purists for over five decades because it delivers that unmistakable, raw exhaust note while maintaining functional noise suppression. MagnaFlow's aluminized steel construction resists corrosion and thermal stress far better than standard mild steel, extending component life in high-heat underbody environments. The large variant of this glass pack design features an expanded internal chamber that reduces back pressure on mid-range and high-RPM engine speeds, allowing engines to breathe more freely while the fiberglass packing absorbs and disperses noise frequencies efficiently.

At 8.56 pounds and measuring 31.3 inches in length with a 4.35-inch outer diameter, this muffler balances realistic weight distribution and mounting footprint compatibility across a wide range of vehicle platforms. The 2.5-inch inlet and outlet diameter matches common aftermarket exhaust piping specifications, making bolt-on integration straightforward for custom and bolt-together exhaust systems.