I've never heard of Option exhausts. Just a quick search and Option Racing looks like a cheap knockoff distributor. So as far as fitment goes, it'll be a shot in the dark. It might fit just fine, but it will more than likely have fitment issues. Especially if you have an unknown brand cat back exhaust. IMO you're better off just spending a few bucks more on a Megan Racing header. I personally don't hold Megan Racing to high standards but they are far better known and rarely does anyone mention fitment or performance issues with some of their stuff.