ive had my 2004 g35 coupe for about a year now. im starting to get bored with it so i decided to start modifying it. i found a relatively cheap cold air kit on ebay. just want to know why its a lot cheaper than say an injen part.
like 75 bucks compared to 2 or 3 hundred... ill inlude the link. also if you have any other advice for cheap upgrades that would be great as well. thanks

http://www.ebay.com/itm/400315782831...84.m1423.l2649