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
standards. Because of the lack of an air pump and other
assorted hardware required for using a catalytic converter,
we do not offer a street-legal replacement 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 racing 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.
The RP Performance
Mufflers are designed with performance and sound quality
in mind. They exactly replace the stock muffler and
bolt directly to the stock connecting pipe. The dual
chrome tip design is aggressive yet retains the original
stock styling. Sound levels are up only slightly from
stock but sound quality is MUCH improved with a deeper
growl. Durability issues have also been addressed by
constructing the muffler with heavy wall materials
and stainless steel wool packing. Overall, this is
the best all around muffler we’ve ever used on
the 1st generation RX-7.
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.
These systems simply bolt up to the stock exhaust
manifold and connect to the stock or aftermarket
cat back exhaust systems.
Performance Converter System
also offer the Bönez Main Cat Race Pipe which
replace just the main catalytic converter with a
straight pipe. This unit makes it extremely easy
to swap between the stock cat and racing pipe for
extra HP for track events yet still remain legal
for the street.
Note: Not be legal for street use in some states. Racing
what’s needed for your custom RX. These catalytic converters
are the same quality units used in their direct bolt in systems.
Recognized as the freest flowing and most durable of all the catalysts,
you simply can’t go wrong with Bönez. Available in a
variety of pipe sizes.