I would suggest you get arrow headers. Ive got them on mine. I ran into another forum member in the UK on the weekend. He had delcavic headers on his and the bore on my headers is noticably larger. Another nice thing about arrow stuff is its easy to get spares also - every individual part is obtainable if, for example you damage something or want to change the exhaust configuation (i went from dual exit to single exit) and bought the tail section of the header separately.