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The MagnaFlow 4in. Round Glasspack Performance Exhaust Muffler 18146 enhances your ride with the deep, classic sound that glasspack mufflers are known for. The round muffler body features a free-flowing reversible straight-through 2.5/2.5in. diameter configuration and single stage packing with a satin finish. This weight-optimized glasspack muffler is engineered to bring out the inner hot rod in your ride with plenty of volume and dyno-proven performance, so please check to ensure compliance with local noise regulations. 18146 offers flexibility when it comes to installation thanks to its universal design, however, professional installation is recommended. Muffler 18146 is made of corrosion resistant aluminized steel and produced using CNC precision robotic manufacturing techniques, all backed by MagnaFlow's 90-day limited construction warranty.