I've recently acquired a dual down pipe manifold for a B20b engine. I'm looking for the next section- 2 into 1 header pipe. They come with the Skandix package but I only need the pipe. My local Volvo dealer parts book only goes back to the 240 series and gives a part number #462821. The B18b number for the same piece is 672196. Does anyone know if these are the same pipe (different years = different #'s). Was there a generic 2 into 1 header pipe that fits all dual down pipe manifolds? Thanks for the help in advance. Bill