I found out my headers will not work with my angled plugs so I am getting a new set. I have never used a Header with a slip on style collector so I have a question about them. First do I just weld a 3 bolt style Collector flange on them? That is what I have at the end of my exhaust pipe going to the header for the old Flowtech style headers. Also I put my Headers in with my engine so will I have to lift it out to remove them? These are the Headers I will be purchasing. http://www.summitracing.com/parts/SCH-185M/