The APR Turbo Muffler Delete replaces the factory muffler with a straight, unbroken piece, CNC machined from billet aluminum and black anodized. To ensure a proper seal, APR engineers took a two-part approach. A Viton gasket is included and forms a seal between the base of the muffler housing and the new part. With the gasket in place and the outer flange installed, the muffler delete tube screws into place, forming a complete, uninterrupted path for airflow. APR's 2-piece design explained : As with all machined parts, it is impossible to make all parts identical. In the case of the turbo muffler housing, the distance between the bottom and the top of the muffler housing varies from turbo to turbo. The acceptable measurement range is known as the tolerance. The nominal distance between the top and bottom of the turbo muffler mounting points is approximately 51mm. The tolerance on this part can be as loose as +/- 0.5mm or more. This means some muffler housings will be up to 51.5mm high or as low as 49.5mm high. Since the distance between the top and bottom of the muffler chamber will be different on every turbo, a one piece turbo muffler blanking will always be either too high or too short. On systems that are too tall, the blanking will touch the bottom but not touch the top mounting point, creating an imperfect seal and the potential for a boost leak. If the part is too short, the system will seal at the top, but leave a small gap at the bottom, thus defeating the purpose of the part as shown in the diagram below. APR's 2-piece design solves this problem with an adjustable-height design. Although a 2-piece design is more difficult and expensive to manufacture, it is the only way to ensure a precise fit and a perfect seal. APR supplies a Viton seal which is placed at the bottom of the muffler housing. The muffler cover is then installed forming a gasket with the factory gasket. Then the center tube is inserted and screwed into place to the desired depth, compressing against the Viton seal to ensure a tight seal in all scenarios. Finally, the tension of the seal prevents the tube from coming loose and the included Loctite provides additional security against movement. With the turbo muffler removed, the APR design provides a smooth, turbulence-free, and sealed path for existing airflow into the turbo ! Features: Removes factory turbo muffler Improved turbo sound Faster spool Better power delivery 2 piece design with gasket eliminates leaks/factory tolerance issues CNC machined aluminum Black anodized