I need to sell my K&N drop in filter for my TSX. I just got it 1 month ago, but have decided to replace the whole intake box and build my own cold air intake. The filter has less than 200 miles on it, since i only drive my TSX on the weekends. I have the original box and everything. Retail price on the filter is almost 50 dollars in the stores. I am asking for 35 dollars shipped. Please email me @ [email protected] if you have any questions. Thanks!