Sounds like some 90mm silver and carbon tips (slip on) will be ready soon from CYBA. Im choosing to go this route since I dont want to cut any pipes to add the rear cans of an exhaust - and from what Ive heard so far, the stock exhaust is no slouch.
2001 e46 330ci, 2002 e46 M3, 2013 F10 M5 - GONE
2016 991.1 911 Carrera GTS
2016 F85 X5M - Carbon Black/Mugello Red