Vision and scope
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.
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.
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.
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.
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.
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.