They're generic cheap headers, In my case I prefer to leave the oem header instead of installing this, but you could use a 4-1 header, they make good top end power.
i would save the money and buy a 4-2-1 5zigen header top header for a low price. i bought a cheap 4-1 header like said stick to oem as they suck. but does make good top end power for the money
what your doing is known as thread jacking, search first to see if you can find your answer in one of our forums, if you cant, start your own thread and we will all happily answer your question, welcome to the forum