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2008+ STI may require mild clearancing of A/C compressor line
those two points are the inlet and outlet of the filter
the air molecules in the rear of the car get disrupted causing a vacuum of low pressure air
The more air your engine gets
Ford Performance Active Sport Cat back Exhaust Valve Springs/Retainers 2008+ STI may require mildEnhance your Focus RS's performance and add an aggressive exhaust tone with this Active Sport Cat Back Exhaust System from Ford Performance. This stylish American made exhaust kit will also give your RS a unique and custom look! Features: Fits 2016 2018 Focus RS Uniquely designed and tuned to provide optimum performance, aggressive sound, durability and pure driving excitement Retains the factory active exhaust control with a 2. 5 NPP valve