Shorty header from a Focus will NOT fit my car without mods. Whilst it works well with the stock cat, my A/C bracket bolts into the head, right where the shorty headers arch upward. I agree with others that the Cougar header is better. I am having the stock cat relocated to where the resonator is currently located. I am also switching my muffler to an OLD SCHOOL turbo muffler. It is cheap and has a lifetime warranty. It might not sound as good as the Magnaflow, but it gives me 30 dollars for flange work on my stock cat!
http://www.jcwhitney.com/autoparts/Product/showCustom-0/Pr-p_Product.CATENTRY_ID:2006481/c-10101/Nty-1/p-2006481/Ntx-mode+matchallpartial/N-10101/tf-Browse/s-10101/Ntk-AllTextSearchGroup?Ntt=cherry+bomb+turbo+muffler 
