After extensive research and development, the TOMEI EVO exhaust manifold is now avaliable.

Holding the same quality as our other Expreme exhaust components, this 4G63 EVO exhaust manifold is a perfect balance of ingenuity and is more efficient through numerous R & D testing. In the early stages of development, we worked with the original exhaust manifold to find the true limits of the factory production piece. After gathering numerous data from the original equipment tests, we slowly pieced together our Expreme exhaust manifold. 　

The 4G63 Expreme manifold is one of a kind in design. Starting off with its smooth curves, the Expreme exhaust manifold has excellent flow characteristics. The tubing used has a diameter of 45 and is considered to be the best size when achieving for maximum torque. The material used for the piping and flange is aircraft quality SUS304 stainless steel. This material is very durable against corrosion and other harmful elements. Though in time, a light discoloration may be present, it is to be noted that this material will not deteriate. The process used to assemble this manifold together is know as the lost wax method and is very advanced in the sense that it helps promote the strength and long lasting structural integrity. Along side this well developed manifold is a manifold accessory known as a heat shield. This one off in design heat shielding device is also made from durable SUS304 stainless steel. When attached, to the exhaust manifold, this Expreme heat shield will help promote cooler under hood temperatures, thus other peripheral engine devises will have cooler and longer lasting run times.