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Upgrading the stock exhaust system on the 2nd generation RX-7 is going to be the very first thing you’ll want to do in your quest for a more responsive, powerful car. Even with the wildest intake and ported motor, you won’t begin to see the true benefits of the other modifications until the exhaust has been improved.

The exhaust system itself is going to consist of basically two separate components that can either be upgraded at the same time or separately without too much trouble. The first section is the catalytic converter system which consists of everything from the stock exhaust manifold on the motor to the very last main catalytic converter which bolts to the y-pipe. The second section consists of the y-pipe and two mufflers which end at the rear of the vehicle. This last section is commonly referred to as the “cat-back” system meaning everything after the catalytic converters.

On the stock exhaust system, the items that rob the most power are the catalytic converters. For racing purposes, the easiest solution is to replace the complete cat system with a race pipe. If you drive your car on the street though, some form of catalytic converter must remain intact to keep the car street legal. The trick is finding a catalytic converter that flows better than the stock converters, keeps the car emissions legal, and can handle the intense heat of the rotary exhaust gases. In our testing of aftermarket cats, we found that the only one capable of meeting all of our performance and reliability requirements are the Bönez catalytic converters.

Another important factor to remember when looking at upgraded exhaust systems is the provision for allowing the 6 port actuators to work properly. These actuators open up the auxiliary intake ports at higher RPMs for a broad powerband. Since the 86-88 models utilize exhaust backpressure to open the ports, we place a sensing tube at the point of highest exhaust pulse intensity to allow the ports to work properly. This feature, among other subtle “attention to details” features, have all been developed through our extensive knowledge of the RX-7. Something that mail order houses simply cannot provide.

 

 

Non-TurboTurbo II Catbacks

 

Bönez Superflo SystemThe 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. 2.5" piping feeds into a pre-silencer before feeding into our high flow catalytic converter. These systems simply bolt up to the stock exhaust manifold and connect to the stock or aftermarket cat back exhaust systems.

Bönez Superflo System

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Bolt and Gasket Kit
Price
: $20.00
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Bönez Dual Cat System The 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. 2.25" piping feeds two high flow catalytic converters. These systems simply bolt up to the stock exhaust manifold and connect to the stock or aftermarket cat back exhaust systems.

Note: The Bönez Dual Cat System does not fit automatic equipped cars.

Bönez Dual Cat System - 86-91 (fits only manual transmission)
Price: $462.32
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Bolt and Gasket Kit
Price
: $20.00
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Bönez 2.5" Race Pipe We 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!

Bönez 2.5" Race Pipe

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Bolt and Gasket Kit
Price
: $20.00
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Bönez Dual Cat System For those of you looking for a streetable header system on your 86-91. Headers are the ideal way to get the last percentage of tuned power from your normally aspirated engine. For quite some time, the only way to have headers was in an emissions “unfriendly” package. Now we’ve combined the best of both worlds. Headers and the famous Bonez performance catalytic converter. Don’t forget: You must keep the air injection system functional on your car to make the emissions system work right. (ex: air pump, air control valve, etc.)

And for 1986-91 RX-7 owners who have a Racing Beat header and presilencer system on your car needing to pass emissions testing, this converter is the perfect way to return your FC to emissions pass-ability. This Bönez catalytic converter is a bolt in replacement for the Racing Beat presilencer.

Racing Beat Street Header/Bönez Cat System - 86-91 Non-Turbo
Price: $529.00
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Bönez Catalytic Converter only - for use with Racing Beat Street Header
Price
: $250.00
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Bolt and Gasket Kit for installation of cat to header
Price
: $20.00
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Bönez Turboflo System The Bönez Turboflo Exhaust System has been designed to give optimal safe HP gains by utilizing a 2.5" downpipe and an unique ultra high temperature, high flow 2.5" catalytic converter. This system helps reduce the stress placed on the engine and turbo and keeps noise levels down at an acceptable, sporty tone. We’ve found that many stock catalytic converters get more restrictive after time and are the cause for loss in performance and increased engine wear.

Bönez Turboflo System - 87-91 T2
Price: $369.00
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Bolt and Gasket Kit
Price
: $30.00
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RP Aftermarket O2 Sensor
Price: $40.00
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Bönez 2.5" Downpipe This pipe is a perfect replacement for the factory connecting pipe of any 1987-91 Turbo II. The pipe fits between the factory precatalyst and the main converter and frequently rusts beyond reuse. Our pipe is slightly larger ID at 2.5" and can be used with any combination of precatalyst or Bonez downpipe, main catalytic converter or midpipe.

Bönez T2 2.5" Connecting Pipe
Price: $75.00
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Bönez Race Pipe Main CatWe 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 legal for street use in some states. Racing use ONLY!

Bönez Race Pipe Main Cat - 86-91
Price: $60.00
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Bolt and Gasket Kit
Price
: $20.00
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Bönez 2.5" Downpipe The Bönez Racing Exhaust components give the Turbo II a noticeable increase in performance. The pipes replace all the catalytic converters to optimal flow and less stress on the engine and turbo. Boost levels will also increase approximately 1-2psi over stock and depending on what other modifications have been made, you might experience the factory fuel cut. We offer a fuel cut defenser that tricks the stock computer into thinking it’s running under the factory cut off point.

Note: Not legal for street use in some states. Racing use ONLY!

Bönez 2.5" Downpipe - 87-91 T2
Price: $137.00
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Bönez Performance Main ConverterWe also offer the Bönez Catalytic Converters separately as a directly replacement for the stock main cat. These unique cats utilize 4th generation catalytic convertor technology and are specifically designed for the rotary engine. They are available with a 2.5" inlet/outlet diameters and will bolt to stock or aftermarket cat-back systems.

Bönez Performance Main Converter - 86-91
Price: $250.00
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Bolt and Gasket Kit
Price
: $20.00
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Blank ConverterJust 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.

Bönez Performance Converter (Blank)

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RP 50mm Cat-back Economical system which offers good performance and a low, baritone sounding exhaust note. Our best selling system. Installed in cars producing up to 400WHP.

RP 50mm Cat-back - 86-91
Price: $495.00
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A’PEXi N1 Racing ExhaustRace bred exhaust system. Minimal bends with increasing diameter piping for highest exhaust flow. System includes a presilencer for a mellow tone. Please note, this system is designed for max power and uses a single sided exhaust outlet. Piping diameter: 65-70-85(mm). Note: Due to the box dimensions, a UPS oversized surcharge ($55.00) will be added to the total.

A’PEXi N1 Racing Exhaust - 86-91
Price: $549.95
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A’PEXi Dual N1 Racing Exhaust - 86-91
Price: $1098.00
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A’PEXi N1 Silencer Can be used with APEX’i N1 system to reduce noise while street driving (this unit is included with the GT system). Made in Japan by Apex’i.

A’PEXi N1 Silencer

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A’PEXi N1 Silencer Removal Tool
Price: $16.50
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A’PEXi GT Racing ExhaustAbsolutely the highest flowing street system we sell. FULL Stainless Steel construction. Presilencer built-in. Race developed single sided outlet, Comes with bolt-in silencer for street use. Piping diameter: 65-75-85(mm)

Note: The A’PEXi GT Exhaust is on sale for a limited time.

A’PEXi GT Racing Exhaust - 86-91
Price: $649.95
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GReddy Power Extreme ExhaustNow back in stock, the famous GReddy Power Extreme catback exhaust. Long known as the “King Kong” of FC exhaust system. The quality is obvious, high polished stainless silencers, straight though design, deep sporty note, what’s not to like? These are probably the last ones we’ll be able to bring in. Priced with an incentive. Get a system while they last.

GReddy Power Extreme Exhaust - 86-91
Price: $898.98
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