Will it affect if the round pad of the exhaust pipe interface of the cart is not installed?

It will leak air and make a lot of noise. Some cars have no interface gasket, and the exhaust gasket is broken. I will find the exhaust noise loud and annoying, but for the environment, there are not only noise effects but also exhaust pollution.

Copper wire can be used to connect the interface pad, and the bolt of the exhaust pipe interface pad can be tightened at the high temperature of automobile hot start, which makes up for the leakage of the exhaust manifold, enriches the gap of the exhaust manifold and greatly improves the sealing performance of the interface. In order to improve the sealing performance, there are many ways to connect other items and seals like this. For example, in order to prevent oil seal from leaking, cotton thread or adhesive is wrapped around the joint; In order to prevent the air conditioner from leaking fluorine, an elastic adhesive tape is wound at the end of the interface nut; In order to prevent the valve cover from leaking oil, the upper end of the cylinder head is covered with a film.