The "hardest" part is you have to really push the drivers side filter high up on the tube to clear components when sitting in position. Same stock cover.. take the OEM style filters out and seal those boxes up.. silicon.. foam seal.. whatever you feel best with. I had actually bought an intake for a Honda accord (x2) and cut the tube about 6" shorter to make mine before these popped up. I had purchased some used Needswings dual K&N filters from a user that aren't as big as these and fit easier. This came up on Ebay and I made the purchase for my wife's car. (They jacked the prices up on the Honda setup..lol)