The 1987-91 RX-7 TURBO II Down Pipe/Presilencer combination incorporates a 2.5-inch 0.D. Down Pipe and a perforated stainless steel core and stainless steel wool-packed Power Pulse Presilencer to boost power approximately 14% - a 26 horsepower increase on a 1987 Turbo II RX-7 - and maintain a comfortable exhaust noise level during full power driving.
The replacement pipe connects to the turbo outlet flange and eliminates the catalytic converter, while the presilencer connects to the factory y-pipe for a complete bolt-on system. A mounting position for the oxygen sensor is provided in the replacement pipe.
The replacement pipe reduces exhaust gas back pressure, resulting in a turbo boost increase of 1-2 psi, without the use of an external boost controller. Our Fuel Cut Controller 87-88 or 87-91 is recommended to prevent fuel cutoff to the rear rotor. This kit contains mounting hardware, a split air cover plate, and gaskets. The turbo outlet gasket is available separately and should be replaced when installing the down pipe.
Replacement Rubber Exhaust Hangers
It is our experience that the stock rubber hangers that support the exhaust system can deteriorate and crack with age. We suggest the replacement of these hangers when installing replacement exhaust components. If needed, we provide the Mazda replacement rubber hanger for use with your Presilencer unit.