Search for the exhaust removal DIY. After uninstalling the stock exhaust, install the M perf using reverse procedure. All catback exhausts install pretty much the same way. Piece of cake, good luck!
2015 M3 6MT | Yas Marina Blue, CF Roof, Cloth | Adaptive M Susp, 437M 19" Silver | Stripper
2013 X5 xDrive50i | Carbon Black | M Sport + M Perf, 333M | Loaded