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Injen 2015 Subaru STi 2.5L 4 Cyl Polished Cold Air Intake w/ MR Tech and Heat Shield (SP1206P) 1620 but we found that theIs your engine choking for air and in need of some additional horsepower? If so, Injen has exciting news for you! The SP series of cold air intakes from Injen Technology will allow your engine to breathe deeper and enhance the performance that you've been craving. The SP series of cold air intakes is Injen's flagship system in their lines of traditional aluminum cold air intake systems. Injen Technology is the world's first tuned air intake system and