Maruha Sports Metal Catalyzer

(Photo 1) Full contents of Maruha Sports Metal Catalyzer

Make sure that the key to gaining more torque and engine power is installing Maruha’s catalytic converter in your car.

What do you need for your ideal sports driving?
Your list may be long but the two words “More power” will be attested in the list.
Our catalytic converter features not only the function of reducing exhaust gas emissions but also the simple & stylish design. It also provides high exhaust efficiency to powerful driving.

Car catalysts are generally divided into ceramics and metal ones.
Maruha’s product, that's metal material can withstand the heat of more than 1000 degrees of Celsius, maintains its stable performance under severe conditions.
Furthermore, the catalyst honeycomb increases exhaust efficiency without hindering the fumes flow.
The metal honeycomb wall is thin, but has enough strength.
The thinness can provide the catalyst with good heat conduction to perform the function well.
It cannot be operated in cold engines, but otherwise the thin honeycomb wall that can immediately heat up makes the heat conduction better in order to clean up effectively the exhaust (CO, HC, NOx) from cars through the catalyst.
Besides heat resistance, metal catalysts are also required to have high anti-corrosion ability and vibration resistance because catalyst converters are installed in engine systems that vibrate incessantly.

Maruha Sports Metal Catalyzer also features the design with the streamline shape that allows the catalyst performance to increase.
Picture 1 indicates the difference in shapes between Maruha’s product (above) and a popular converter (below).
The popular one is simply connected with its catalyst body and pipelines, that is, the structure tends to decrease the catalyst performance by accumulating the exhaust gas on the corners of the catalyzer inside (shown by the black arrows).
We have solved the problem by means of streamlining our converter with slight curb to promote the exhaust efficiency.

Above: Structure of Maruha Sports Metal Catalyzer
Below: Structure of a normal catalytic converter

Flanges are required in order to connect Maruha’s converter to other emission systems.
Our flange is designed to meet the allowances of the genuine MIATA gaskets in common with NA6 and NA8 models, besides the precise connection between the flanges and the 60 mm pipe (Photo below) can prevent gas leaking, increasing the exhaust efficiency.

Moreover, the pipe that's outside diameter is 60 mm helps the Naturally Aspirated (NA) type MIATA to gain its power.

Graph 1 shows the results of the performance test of the genuine MIATA catalyst converter and Maruha's catalyzer.

(Graph 1) Performance test of catalyst converters
Horizontal-axis: Revolutions per minute (RPM)
Vertical-axis: Horsepower (PS)

The conditions of the test are as follows: Graph A (blue line): the genuine MIATA catalyst converter with an exhaust manifold manufactured by other than Mazda and Maruha
Graph B (red line): Maruha Sports Metal Catalyzer with an exhaust manifold (product same as Graph A)
Graph C (yellow line): Maruha Sports Metal Catalyzer with Maruha's original exhaust manifold (in development)

The maximum horsepower of Case A is 160 PS.
The genuine product works well if we consider that it is set in the engine system with usual specification, but in Case B the car has more power by only changing the converter.
It shows that replacing a catalytic converter contributes to an increased exhaust efficiency. Furthermore, when our exhaust manifold in development is connected to Maruha’s converter (Case C), we found that the car gains up to 170 PS by enhancing the exhaust efficiency.
* Please note that not all engine systems can have the same conclusions as the one in the test above.
There is a possibility of varied results depending on different conditions including engine performance, environment of installing mufflers and air cleaners, and so on.


Maruha Sports Metal Catalyzer, that can withstand a heat of more than 1000 degree Celsius, might become damaged under the following conditions:

[NOTE] The product should be installed by a professional.


Maruha Motors Co., Ltd.
Ushizuma 2095-6, Aoi-Ward
421- 2106 Shizuoka city, Shizuoka prefecture
TEL: 0081-54-294-0076
FAX: 0081-54-294-1312