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Yes you can and it would not hurt anything, Ford likes to make people beilive that you cant do this stuff because it will hurt the enigine and on and on and on, but it is bull, In fact I have a 99 ford f150 4x4 with the 5.4, I have 2 striaght pipes on mine front he cats back and have had no problems in the last 75,000 miles they have been on it, and it will increase your horsepoer and torque too, and it is not too loud either just gives it a nice deep loud tone.

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โˆ™ 2015-07-15 18:45:29
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Q: Can you run straight pipe after the converter if you leave the single exhaust pipe on a Triton 5.4 without damaging valves?
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