Mercedes-AMG W177 A45/S Fi Exhaust (Frequency Intelligent Exhaust) high-performance valvetronic exhaust system is direct replacement bolt on system manufactured out of a high-grade T304 stainless steel that offers an exhilarating soundtrack.The Fi EXHAUST system is designed with a valvetronic technology to control airflow, sound volume and enhance the overall performance and torque. On average horsepower is expected to increase from 5-10% after installing a full catless system, which includes a valvetronic catback and ultra-high flow downpipe.When valves are closed exhaust gasses are routed through the muffler resulting in a low-profile comfortable drive. However, when the valves are fully open an intense and sporty soundtrack is produced.Switching between street and race sound profiles can be done using factory exhaust/sport button or drive mode, or optional Fi EXHAUST remote control and mobile App.The unique sound and performance for Mercedes-AMG W177 A45/S is achieved through individually designed muffler internals that are fabricated to offer an ultimate driving experience.Please note each part of the Fi EXHAUST system needs to be ordered separately.Exhaust system is available for both OPF/Non-OPF vehicles.Different exhaust parts are offered depending on the vehicle version.Please note that the actual product may vary in appearance depending on the year of the car and area. The exhaust system is also subject to changes to the design over an extended time period. Product pictures are for illustration purposes only.Catback Exhaust:Non-OPF Version:Front Pipe + Mid Pipe + Valvetronic Muffler (Compatible with OEM elect. Valve - No Remote Control Included) (MB-177A45F-CBE + MB-177A45-LKP + OPFCAP-001*1)Downpipes (Optional):Non-OPF Version:1.Ultra High Flow Catless DownPipe (MB-177A45F-NCATSP + OPFCAP-001*2 + OPFCAP-002*1)2.Sport 200 Cell Catted DownPipe (MB-177A45F-CAT200SP + OPFCAP-001*2 + OPFCAP-002*1) NOTE: Upon receiving the item, please ensure that the part is indeed the correct item you have ordered. This can be achieved by checking labels on the packaging. Please also ensure a proper test fit of the item is conducted prior to paint and/or installation. Returns/Warranty claims will be voided if the item has been tampered with, or is no longer in resalable/new condition.