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aFe Power 4-1 Twisted Steel Exhaust Manifold - 06-14 WRX / 08-20 STI

aFe power introduces an all new Twisted Steel Header for the 2004-2016 Subaru WRX STI with H4-2.5L engine. In testing, this header produced a max gain of +9 horsepower and +13 ft. lbs. of torque verified by our in house dyno. aFe spent countless hours of R&D to develop the perfect balance of pure race-inspired performance. Theses headers are constructed of near equal length mandrel-bent 1-5/8” into 2-1/2" 16-gauge, 304 stainless steel tubing and uses 3/8" thick flanges for strength . . . Show More >




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