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Do a quick search, there's a couple vids of straight-piped X1s.
Honestly, it's either that, or buy a BMWPE or aftermarket 135 axle back, lop of the muffler of both it and your OE axleback, and weld the 135 muffler to the OE axleback pipe.
Guess you could gut the stock one as well.
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'02 S54 M3 (500/500 GC/Koni)
'08 N54 135 (JB4, DCI, BMW PS/Bilstein B6s, H&R M3 FSB, Strongflex FCABs)
'14 N55 X1 (JB4, BMS DP, BMS Intake, Alpina TCU reflash, H&R Sports, Bilstein B6s, E93 M3 RSB, Strongflex FCABs, baby seat)
'08 N54 535xi touring (Bilstein B6s, Downpipes, MHD tune, baby seat)
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