Cobra Sport performance exhausts enhance the sound, looks and quality of your vehicle giving you the ultimate driving experience. Our sports exhausts range is fully guaranteed to give you assurance of our quality.This Audi S3 performance exhaust fits from the turbo backwards (turbo-back system), these parts replace the front pipe, centre and rear sections.The sports cat option has been designed with a 4.5 in/114.3mm 200 cell high flow sports catalyst, maximising the flow rates and optimising the tuning potential of Audi Sport's iconic hot hatchback.The high flow sports cat version will enable you to pass a UK MOT emissions test or police road side checks.The de-cat exhaust is sold for motorsport and off road use only and will NOT be able to pass a UK MOT emissions test or police road side checks.This resonated sports exhaust includes the centre silencer and has a subtle but sporty tone. This exhaust is also available as a non-resonated version (excluding the centre silencer) which is a louder option, as it excludes the centre silencer and therefore, has a sportier exhaust note.All relevant fittings and gaskets are supplied. (Except turbo clamp).This performance exhaust retains the use of exhaust valves. When switching drive modes (e.g. Comfort to Dynamic mode) your exhaust tone will continue to swop from quieter to louder tones as before.IMPORTANT: this exhaust removes the PPF (Petrol Particulate Filter) and will require engine tuning at time of fitment to cancel the EML light.Fitment is for motorsport and off road use only as this system removes the PPF filter.