Invidia 08 Subaru STi Silencer (for N1 Exhaust System w/ 101mm Tip)

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About Invidia
Far more engineering goes in to the design of an exhaust system than many realise. From a performance perspective, there is a fine balance between exhaust back pressure and exhaust gas velocity. Too large a diameter pipe, and low down power and torque is sacrificed (particularly on naturally aspirated cars), too small a diameter or added restrictions and bottlenecks in the system, and the engine is unable to push gasses out of the combustion chamber efficiently, reducing power and torque. There are many other technical aspects such as scavenging effect which are beyond the scope of this document, but the point is, it's not as simple as just strap on a drain pipe and gains for days. A quality exhaust system maximizes performance gains by design. Invidia High Performance employ a team of engineers and conduct thorough research and development for every single exhaust component they manufacture, ensuring performance to match the customer's needs in every instance, including the use of the highest quality High Flow Catalytic Converters where applicable.