the extreme filters were possibly meant for the track only as most folks remove the grille. i think oledoc hit the nail on the head, when i bought cruzinquicks dual cai for my slk32 i already had the supercooler. no way the oem grill was going back on my 32. i had a custom grill made and everything just barely fits.

so you have 2 choices, custom grill to allow more room or the regular filters