The MagnaFlow D - Fit Performance Exhaust Muffler Replacement Kit Without Muffler 19440 19440 replaces the restrictive factory muffler of your Truck with fast - flowing mandrel bent 3in. tubing, while maintaining the OEM piping and tailpipe. Exhaust Muffler kit 19440 features a direct - fit, easy - to - install design and is produced using CNC precision robotic manufacturing techniques. This exhaust system's durable, corrosion resistant stainless steel construction is backed by MagnaFlow's limited lifetime warranty.