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i put a header on my 02. it was a bitch. the header bolts were easy as cake. as for the 4 bolts holding the header onto the cat, those were hard to get off. They said in the instructions to take the airbox out and the alternator for some reason. i didnt do any of that. Putting the new header in was easy. but i had to weld a piece onto the cat. So i had to take the cat off. i dont no about the obx, cuz i have a passetter.
i got the obx header and its a pain in the ***. i tried to do it myself and made a 300$ mistake....just get it professionaly done, lot less of a headache and money...trust me.