Doug's Headers D6659 1-5/8" 4-Tube Manifold Replacement Metallic Ceramic Coated Exhaust Header for Ford Truck 5.4L 04-07 Review
Doug's Headers D6659 1-5/8" 4-Tube Manifold Replacement Metallic Ceramic Coated Exhaust Header for Ford Truck 5.4L 04-07 Feature
Doug's 2WD Truck Headers Header development and design is complex and requires a substantial amount of time and resources to do the job right! Every Doug's header is tuned with the proper tube size and length to efficiently remove all the exhaust from each cylinder, reducing pumping losses resulting in a dramatic increases in horsepower and torque. Doug's headers are carefully developed on the vehicles they are intended to fit and are re-checked numerous times during the design and manufacturing process.
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