if your home made set up reaches down into that space in front fo teh wheel well i would jsut leave it alone. you have teh same 3inch tubing that all teh metal ones use, so it isn't like they are gonna pick up a bunch of airflow over what you currently have.
even if it doesn't reach all teh way down it can be refabbed to do so for a lot less than $150 and you will benefit teh same.
i have never really been a fan of teh k&n unit. the tubing necks down a bit at that narrow area.
later
tim
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