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Here is a before and after pic of a TJ http://www.rockcrawler.com/techreports/kn_fipk_tj/page2.asp Notice the hard angles and flex hose (bad for air flow) on the OEM piece Versus the nice flowing bends of the FIPK. The FIPK comes with a heat shield too. I installed it myself in under an hour. It uses the original holes. I had a little truble since I have a body lift. Since the engine sits further down in the car the bolt holes were further away. Suffice it to say that a 4" body lift would pose a problem. 3" was ok.
FIPK advanmtages are also that you can easily put the oem goodies back in if you are worried about emissions or warranty issues.
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