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Mercury C4 The next step up from the Shift Improver Kit is the Transpak
OEM 7mm - 4
making it 22% harder (115 HV)
Includes Hardware
AEM Induction Cold Air Intake System (21-478WR) 40190 Mercury C4 The next stepThe AEM 21 478WR Performance Cold Air Intake System produces horsepower and torque gains by replacing your vehicles restrictive factory air filter and air intake housing. This air intake system was designed, tuned and dyno tested to fit specific Subaru WRX, WRX STI, Impreza WRX and Impreza WRX STI models. Air enters the system through an oversized AEM Dryflow synthetic washable air filter for outstanding air flow, filtration and performance. The air
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