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ha no. your gonna get 2-3 HP. the only difference between a cat back system and buying a muffler and having the pipe size increased to whatever inlet outlet your going with, is bolt on vs weld. your paying for the convenience of doing it in ur garage, vs having a shop go to work with the welder.
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2003 F150 5.4. 20" Bazo B4 wheels wrapped in Nitto 420S. 3" Dynomax Bullet . K&N Intake. 2" rear drop shackles. 4:10 gears. Slotted Rotors. 8K HID
Bullet Start up/Rev
Bullet WOT
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