AMA - Výfukové systémy

Consulting

Our main concern alongside the actual production of the exhaust systems is also the whole customer experience. From communication with the customer, through consultation, design of the system up to its final production. You don´t have to waste hours of your time researching what exhaust parts you need to buy in order to achieve your goals. All you need to have is a vision what the end result should be. What engine power it needs to be able to support, visual design you prefer, how the exhaust should sound. Just let us know about your vision and we will do all we can to materialise it.

Vision and scope

As with all other modifications, it is necessary to have a well thought out outcome that you want accomplish with the new exhaust system. Your vision and goal are key to determine the scope of the modification, what exhaust parts need to be replaced and it will also determine the physical construction of the system. We can broadly divide the goals of the outcome into three categories. Change of the appearance (visual design), change of the sound and increase of engine power output. Every goal has its own technological constraints and the goals will always affect each other. For example, if you want the exhaust system to focus on the best performance increase possible, there is a high chance that this won´t be achievable without it being loud. Also, you cannot maximize the performance increase and still retain the original emissions system. A radical change in appearance can lead to compromises in performance and / or sound. That’s why it is best to have the goals very well thought out.

Engine power

The main focus of the design of all the parameters of our exhaust systems is always functionality. That means optimising the flow of exhaust gases through the exhaust system of the car. The stock exhaust systems are designed with a lot of compromises in mind, that can affect the overall performance of the system. By optimizing the parameters and getting rid of the compromises we are able to help the engine to make significantly more power. But as always, there are technological constraints in doing so. The main constraint is usually the emissions system. If the car is to be used on public roads, the exhaust system needs to have a catalytic converter, which is a relevant flow restriction. Second constraint is the overall loudness of the exhaust. It is fairly common, that an exhaust system focused on best performance possible is too loud to be used on public roads. The last constraint is the space in the chassis / body of the car. Space limitations in the path of the exhaust system can compromise the overall performance of the system.

Sound

Piping diameter, muffler shape and construction, as well as the design and location of the end tips, all of these aspects shape the overall sound of the vehicle. Choosing the right combination of these elements enables us to change not only the overall loudness, but also the tone and character of the sound. Each individual customer can have his own unique setup to his own liking. We should note, that stock emissions systems are also a good sound silencer and can cause a restriction when you are aiming for a really intense sound.

Gasoline engines:
On a pre 2019 (without a GPF filter) car, a change of rear muffler is usually enough to achieve a mild to decent change in sound. Changing centre and rear sections should be enough even when a strong sound is desired. It is also possible to achieve a stronger sound of 2019 and newer cars (with GPF filters), but changing both centre and rear section is typically necessary.

Diesel engines:
On older diesel engines without a DPF filter, it is generally possible to achieve a stronger sound without any changes to the emissions systems. Even a significantly stronger sound is achievable. More modern diesel engines with DPF filters are quieter by design. In most cases it is possible to achieve some sound change on car in EURO 5 norm (until cca 2014 – 2015) by changing all the exhaust sections after the DPF filter (centre and rear sections). On new diesel engines in EURO 6 norm (from 2015 upwards), the emissions system is so good in silencing the engine tone, that there is almost no improvement in sound possible with the stock emissions system in place.

Exhaust valves

Valve controlled systems are getting more and more popular these days and they are a stable part of our portfolio. All our valve-controlled systems use highly sophisticated two-way mufflers, which include a quieter and a louder route. We never use the valve as a bypass straight out the exhaust. That is not a good solution and we do not do it. The valve always controls the flow of exhaust gases through quieter and louder routes of the two-way muffler. As of all our systems, customers individual sound preference is key to every design. If the stock exhaust system of the car is equipped with valve control, we can use the original electronics to actuate valves in our system. If the stock exhaust system is not equipped with valve control, we can use either a button in the interior or a remote controller to actuate the valves.

Catalytic converters

As the ecology and longevity of our products is one of our main concerns, we use metal core sport catalysts in our products. Much lower density of our catalysts compared to the stock one’s results in significant enhancements in airflow, hence an overall better performance of the engine. We offer denser 300cpsi units, suitable for road use in EURO4 and EURO5 cars. Our 200cpsi units are suitable for all sub-EURO4 vehicles, including diesel engines. And finally, the thinnest 100cpsi units are used only in motorsport vehicles.