dude, K&N! they make all kinds of filters from all sizes, i got my K&N filter with a 2 1/4" opening to fir directly onto the turbo and it even has a 20 degree bend that i needed so it wouldnt hit anything. trust me, K&N has it, you just have to look. go to their website and look in the filter catalog, they have filters as small as 1.75"!!