Racing Beat Race Down Pipe / Presilencer Kit 86-88 RX-7 NT Auto

Race Downpipe with Presilencer - 1986-88 RX-7 Coupe Non-Turbo (with Automatic Transmission) - Stock 1986-92 13B 6-Port engines with factory fuel injection will see similar horsepower gains with the header and muffler combination or the Racingbeat RX-7 downpipe/muffler combination. Without installing a Holley intake (or other aftermarket carburetor configuration), we recommend using the downpipe and muffler combination as it produces a slightly quieter exhaust note, is easier to install, and is less expensive. When upgrading the intake or fuel injection system, the header and muffler combination offers the greatest horsepower potential.

The downpipe and muffler combination includes a 2.5" outside diameter. Downpipe and a perforated stainless steel core and stainless steel wool filled pre-muffler increase power by approximately 13% - an 18 hp increase on a 1987 RX 7 - while maintaining a pleasant exhaust noise level during wide open throttle driving.

The RX-7's replacement downpipe connects to the factory exhaust manifold and the pre-muffler connects to the factory Y-pipe, replacing all catalysts and intermediate pipes. It is not possible to use just the downpipe to replace just the catalysts. Use of the pre-muffler is required to make the connection to the Y-pipe. Although a short piece of pipe can be used in place of the pre-muffler, we do not offer (nor recommend) this due to the unacceptable increase in exhaust noise.

The RX-7's pre-muffler is equipped with an exhaust back pressure pipe for proper operation of the 6-port actuators. Installation requires the removal of the air control and check valve as well as the air pump. This kit includes all necessary mounting hardware, air control and check valve cover plates and gaskets (1 back pressure sensor and 3 replacement pipe to pre-silencer gaskets). If gaskets are required for the exhaust manifold outlet or Y-pipe, suitable replacement parts can be found in the exhaust gaskets section of the website. For those building custom exhaust systems, we also offer the downpipe separately.

Replacement Rubber Exhaust Hangers

In our experience, the stock rubber hangers that support the exhaust system can wear and crack over time. We recommend replacing these hangers when fitting replacement exhaust components. If required, we supply the Mazda replacement rubber hanger for use with your pre-silencer unit.