I have this combo on my ed30 and i think the milltek sounds great, with a decat. All you have to do to make it fit to your blueflame downpipe, is buy the milltek downpipe connecting pipe from herehttp://www.roadrunnermotorsport.co.uk/index.asp The part number for the pipe is MSAU343It adapts the blueflame downpipe which 3 inch in to 2.75, which is the diameter of the milltek cat back.