If you're looking to install an exhaust pipe without welding, there are a few different methods you can use. The most common is to use exhaust clamps. These clamps will attach the exhaust pipe to the exhaust manifold or header. Another option is to use a slip fit connector. This is a pipe that slides over the exhaust pipe and is then secured with a clamp. This is a less permanent solution, but it will still get the job done. If you're looking for a more permanent solution, you can weld the exhaust pipe to the exhaust manifold or header. This is the strongest and most secure method, but it does require welding.