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makes the exhaust louder due to better flow. they do affect throttle response due to the better exhaust flow throughout the cats. magnaflow 94106 is the loudest high flow cat they make. definately will wake your exhaust up. 40% louder is the norm
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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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