I am not 100% sure, but I am trying to find exactly what needs to done to get the greddy evo exhaust to fit the i4. as far as i know you only need to have the flange rotated to line up with the down pipe correctly.
sounds goodhttp://www.youtube.com/watch?v=uu8njz3rstw
At about 28 seconds til the end of the video is my i4 with the greddy evo II exhaust