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So when I bought my 03 sahara it had a k&n fuel rail and cold air intake installed all ready, it has about 40k on it. I'm just wondering what purpose would a aftermarket fuel rail do for it. There are no proformance chip so I'm guessing the rail would act the same as a stock? Am I wrong in assuming this? Unless previous owner took it out before selling it.
 

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K&n fuel rail

Air filter K&N? Lets in more grit wears out engine faster

Fuel rail is just plumbing to pass fuel from fuel line to injectors plus some have a pressure port and some have a leak prone damper

Never seen an aftermarket 4.0 fuel rail




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