Which is better straight pipe or flowmaster outlaw?
I'm driving a 2006 5.4 l Ford Expedition Eddie Bauer edition and I was wondering if I remove the muffler and put a straight pipe would it damage the engine or would a Flowmaster outlaw be better on the engine
The only things that mufflers protect are your eardrums. It won't hurt the engine at all. It will have an effect on the engine's power curve, although not always noticeable (usually some back pressure caused by a muffler can help low RPM torque but will lower high RPM torque, so taking the muffler off can possibly increase high end torque and lower low end torque.)
Straight pipe is illegal AND stupid.
Why are you trying to make a HOT ROD out of a BOAT?
I'd just save the money for when the transfer case goes!
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