Torque Solution 3" Down Pipe to 2.5" Cat Back Exhaust AdaptorTorque Solution 3" Downpipe To OEM 2. 5" Exhaust Adapter is a must have when installing an aftermarket downpipe. Designed to create a seamless install preventing the usual exhaust leak that occurs when not using our adapter. We chose to use CNC Stainless Steel instead of mild steel like the others. We include a high quality 2. 5" and 3" exhaust gaskets along with 10. 9 grade zinc install hardware. With our choice of materials, you can rest assure this