The MagnaFlow Redpack 4in. Round Glasspack Performance Exhaust Muffler 13129 features the same classic deep sound and dyno-proven performance of our other glasspack mufflers with the additional flair of a stylish yet timeless red finish. 13129's 3/3in. round body and reversible straight-through universal design can be integrated into your vehicle's exhaust system however you see fit, although professional installation is recommended. Check to ensure compliance with local noise regulations. This free-flowing muffler is engineered to add a dose of hot rod fury to your ride. 13129 features durable, corrosion resistant aluminized steel construction and is produced using cutting-edge CNC precision robotic manufacturing techniques, all backed by MagnaFlow's 90-day limited construction warranty.