Our exhaust manifold is made of high grade steel and precious metals so it has a sturdy construction. It is not easy to rust and break so that the gas is not easy to leak. This exhaust manifold is easy to install and fits 01-05 Honda Civic 1.7L perfectly. Our exhaust header can be connected to the tail tube to increase the air flow. At the same time by cooperating with other components gas leakage can be minimized to protect the environment. If you are looking for it don't hesitate to buy it! --Smooth interior of the exhaust manifold --Soft sound for comfortable driving experience --Including High quality hardware and gaskets --Sturdy 409 stainless steel frame for long time using --Increase the flow of air --Offers the flow characteristics for the engine at high engine speeds --High flow catalytic converter allow engine to breathe easier --Decrease back pressure --Improve engine power --Simple assembly needed