With the SUS304 Stainless construction and larger ports with the short-piping layout in addition to the reinforced support design the item is a great addition for those looking for higher power/torque and better turbo response through the whole power band on OEM/Bolt-on Turbo setups.

This is what Tomei has to say about their manifold:

Our EXPREME exhaust manifold is now available for SR20 owners who want a performance upgraded from the genuine exhaust manifold. With our product you can retain the genuine setup and no special modifications are needed to fit the standard turbo. With the SR20DET the exhaust manifold was designed to be close from the exhaust port to the turbine. With the comparison test of our isometric prototype & the factory genuine manifold which also utilizes the same layout, it shows that ours has succeeded in delivering an overall improved performance in both torque and power increase in areas like in the higher RPM range in which you were not able to utilize before. With our extensive testing we have reached the conclusion that the normal design is superior as a total overall efficiency. So to develop an exhaust manifold similar with the design and setup as the factory manifold we were finally able to produce a product worthy to bear our name as a product that has the potential to deliver an overall increase in performance.

Pick up your GENUINE JDM with RHDJapan YK!