chentw where do you live?
You can buy this member DP
http://x3.xbimmers.com/forums/showthread.php?t=1353592 m7mad
ina93 Ultimate-Racing has 3.5" downpipe does not fit the 2014+ X3/X4 35i nor X4 M40i because (EWG) has 4" Downpipe
I have a thread where I tried the Ultimate Racing Dp and didnt work and got one Custom made by @AIMperformanceNJ
http://x3.xbimmers.com/forums/showthread.php?t=1316376