Our rotary exhaust Header/Collector is designed for a bolt-on installation, when used with the appropriate Power Pulse Presilencer, in all 1986-92 non-turbo RX-7s. The combination of this Header/Collector and the appropriate presilencer replaces the stock exhaust manifold and all catalytic converters, along with any intermediate pieces of tubing. (In this application, the presilencer will bolt-up to the factory Y-pipe.)
For optimum performance gains for this application, we recommend that a header be used on an engine configured with a carburetor intake system. For this reason, we suggest another suitable configuration for use on a fuel-injected engine is the Racing Beat Catalytic Converter Replacement Pipe with Presilencer combo. These components offer comparable performance gains, quieter performance and a price advantage as compared with the header/presilencer combination. These components replace only the stock exhaust components located between the stock exhaust manifold and the Y-pipe.
The Header/Collector assembly is constructed with .120" wall, mandrel-bent, mild steel tubing (2" OD primary, 2.5" OD secondary) for excellent durability and noise suppression. Both flanges are laser cut from 7/16" thick steel plate for positive gas sealing. An outlet gasket is included. An engine-to-header gasket is available separately if needed. This header is equipped with an oxygen sensor fitting.