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Gibson 00-05 Ford Excursion Limited 5.4L 1-1/2in 16 Gauge Performance Header - Stainless Women's Clothing AMS is proud to introduceEvery Gibson Performance Header is Dyno tuned and engineered to deliver more usable horsepower and torque at low and mid range RPM highway speeds. Improves engines ability to breathe and cooler operating engine temperature. Designed as a direct replacement for the factory manifolds, using the stock crossover pipe. They are well suited for lowered and raised vehicles, street and off road. 50 State Street legal. Meets EPA and CARB requirements. Will not