Im fabricating a ypipe to go with the thorley headers I ordered 310-y. Anyone have experience with this and can offer reccomendations. Ive got the immediate y pipe to go from 2.5" x 2 to 3" I was just going to get some j bends and a short section of pipe. Is it possible to use the flanges off the factory ypipe with the thorleys and if not where can I get some flanges.