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Home » Subaru WRX/STI » Exhausts & Components » Headers   APS Header for WRX/STi w/out Up-Pipe APS has designed and manufactured what is arguably the ultimate STI header system on the planet. Designed specifically for high powered STI engines, the APS Equal Length Split Pulse Header system delivers an outstanding improvement in power and torque, particularly in the mid RPM range. By dissipating the hot exhaust gasses more efficiently, the APS High Energy Header System lowers the thermal load on vital engine components such as pistons, combustion chambers, valves etc., particularly at high horsepower levels.     Price: $745.00 Out of Stock   « Previous | Next »