I swapped out the plain stock exhaust tips for carbon fiber and brushed aluminum ones to match the carbon fiber performance diffuser.
1 With the carbon fiber motorsport diffuser, the stock exhaust tips on the M2 looked rather plain
2 Time to put on some matching carbon fiber exhaust tips. After much research and searching, I ordered these on alibaba direct from a fabricator in China. The price was only $50 per tip plus a modest shipping fee. This was less than a quarter of the cost of BMW's carbon fiber tips and the quality and fitment were right on. It took less than a week for the tips to arrive by DHL from Hong Kong.
3 Closeup of the tips, which are fully customizable. The stock exhaust has a 68mm outlet diameter, so these have 70mm inlets. The outlets are 92mm and the length is 105mm. I went with a glossy carbon fiber and a brushed stainless steel finish.
4 The inlet side of the tips slide on to the stock exhaust and are tightened down with a 6mm hex wrench.
5 The stock exhaust tips are held in place by very strong spring retention clips. The first step for removal was to generously spray WD-40 into the back of the tips. After letting the WD-40 sit for 10-15 minutes, the outer tips could be rocked off by hand.
6 The inner tips seemed to be secured more firmly and needed some not-so-gentle persuasion. There are lots of online videos showing people banging the tips from the rear with a rubber mallet and blocks of wood. Since I had no intention of saving or reusing the stock tips, I went with a pair of big-ass slip-joint pliers that I used to twist and pull the tips off.
7 The right side with the new tips in place. The carbon fiber is blacker than the gray of the diffuser, but it still looks better than the stock tips.
8 Right side done with the left side still stock for comparison