i have made two custom setups...with a new 3" intake form the front bar, covers etc.
I went back to stock..wacked in a trust high-flow filter and saw the same, if not better, dyno results. The sealed setup + pressure of the seal stock boxes make them hard to beat IMO. There have been numerous external tests which have showed without a sealed unit u are pretty much wasting ur time. After making numerous custom setups for both my cars...I now have stock airboxes...but beter ducting/intakes.
Makes no "whoosh" noise, and 1 less defect for them to get me on in the future