Upgrading the exhaust system on a rotary engine car has
always proven to be the easiest way to increase performance.
When upgrading the system, you want to improve flow as
much as possible for maximum power. If you drive the car
on the street, then you must have a catalytic converter,
otherwise you’ll get the biggest power gains from
a racing system.
During the RX-7’s first two years, Mazda used thermal
reactors instead of catalytic converters to meet the emissions
we do not offer a street-legal replacement system for these year
1981-1985 12A Models
Beginning in 1981, Mazda moved to using catalytic converters
and did away with the thermal reactor system. Since the
converter technology was very new at the time, the systems
were very restrictive and sapped power from the engine.
Replacing these converters with a high flowing unit or
a race pipe is one of the best things you can do to
help engine longetivity, increase performance, and increase
1984-1985 13B Models
The limited quantity GSL-SE, with its 6-port 13B engine,
had an exhaust system similiar in many ways to the 12A
model but unlike the 12A models, it utilized exhaust backpressure
to open up additional ports on the intake manifold for
high RPM operation. When upgrading to a high flow system,
it’s important to address this difference properly.
All Bönez systems have provisions to help make the
6-port system work properly.
Bönez Street Exhaust Systems utilize an ultra
high temperature, high flow catalytic converter that
has been specifically designed to handle the high
exhaust temperatures the rotary engine produces.
Performance Converter System
The 81-83 system replaces both converters (main cat and precat) with a
Bönez high flow converter and a presilencer. It
will easily pass the annual "sniffer" test and clean up your
exhaust to eliminate that special rotary exhaust "smell".
The 84-85 system replaces all three converters (main cat and both precats) with a
Bönez high flow converter and a presilencer. It will pass a tailpipe
"sniffer" test and get rid of that heavy rotary exhaust "odor".
These systems simply bolt up in place of the original parts.
The optional Bolt and Gasket kits are recommended for a simple installation.
also offer the Bönez cat replacement "Race Pipe" which
replaces all the catalytic converters with a
straight pipe and presilencer. This is a great upgrade
for a car that gets used for track events.
Note: Not legal for street use, sold for racing use ONLY!
what’s needed for your custom exhaust system. These catalytic converters
are the same units used in Bönez direct bolt in systems.
Recognized as the best flowing and most durable of all the catalysts,
you simply can’t go wrong with Bönez. Available in a
variety of pipe sizes to match your custom exhaust system.