I need help with this BIG TIME! with header to tip problems

[appleyard3]

hey guys i have a 07 mazda3 and i want to get new headers and the down pipe so i can fit the speed3 exhaust on there but the OBX one doesnt fit the 07, that true? and if it doesn't fit is there another brand that will fit? or is this header - tip project only works in my head?

anything you can advice is greatly appreciated.

Thanks in advance