TEGIWA Turbo Exhaust Manifold. Fabricated from thick walled 304 scheduled stainless steel tubing. This manifold is an exact replacement for the original cast manifold – no other modifications are required. It features near equal length runners with multi-pass TIG welded joints. All flanges are CNC machined from 1/2″ 304 stainless steel with a flared design on runner entry. Power gains can be expected throughout the entire rev range.