Gibson Exhaust 9521 GIB9521 2004 F150 STD CAB SHORT BED 4.6L ALUMINIZED DUAL EXHAUST SYSTEM

Designed for the race enthusiast to give you the deep powerful race truck rumble with impressive acceleration and increased horsepower gains. Designed for hassle free, bolt-on installation. Typical dyno tested horsepower gains average are 10-15 and 15-20lb-ft of increased torque. Not recommended for heavy duty towing. Noise level may exceed 95-decibel standard.