I believe there are two filters for the new cars, atleast two different sizes
Oil Filter Listings
there are engine codes of G and F, do you know which one is yours???
click each one and see which one you bought, and purchase the oppositte one... thats my only thoughts...
*edit*
here is a listing of K&N Air and Oil Filters for all galants, you can view yours: K&N Filters
Bookmarks