my guess is that the filter points down (as opposed to the pipe curving and pointing in to the center like on the Stillen), and therefore interferes or is obstructed by the OEM resevoir. I had Injen on my RSX-S and it was the same story. The intake came down between the bumper and wheel well and then curved so that the filter was pointed to the grille. without replacing the reservoir the filter would not fit.
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