They are ebay headers for 98-02 fbody yes I had to notch the frame on the passenger side. drivers side i had to cut the collector pipe and turn it to aim straight towards the rear and a small modification to the shift linkage. It was a small price to pay considering the headers only cost 190$ shipped and they are stainless. all the other headers where at least 575$+ and they were not stainless or long tube.
http://www.ls1truck.com/forums/attac...5&d=1304092255