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I'm running just a K&N cone filter on my s13. However, the hole bellow the filter (where the resonator box was), I installed a piece of 3" aluminum flex tubing. I extended it from the hole below the filter to the end of the splash skirt which runs between my bumper and skirt. For those americans in the crowd who have that black grill where us canadians have a set of running light in our bumper can install that tube behind the vent.
It will cost you less then 15 bucks in tubing and zap straps.
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