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I have a 2003 zo6 with the standard LS6.
Is there a direct bolt on replacement header that I can buy where I can use my factory "H" pipe all the way out to the tail pipes and not have to make modifications to get the headers on ?
Yes. Any of the short tube headers made for 01 and up C5/Z06 will bolt right on. But beware... by considering shorties you will incur the wrath of the long tube Gods. - C.
You probably won't be happy with the shorties unless you live in California where they are the only CARB legal headers available. Not a big gain over stock. Don't have any experience with the shorties but if I had to go with them I would check out the set made by Callaway.