My 2012 E550 is now the fastest (stock-turbo) in the world* with an 11.62 @ 122.5mph. Running a full custom/experimental tune now which is only on my car in it's current configuration. A big thanks and shout-out go to Eurocharged ATX for their patience, and can-do attitude when it comes to the E63's little brother, the E550! She ran the 11.6 on a Dragy last Friday(5/8) and this past Friday(5/15) I backed that up at Little River with an 11.7@ 120. 60' times still suck(1.9's), but a TCU tune should fix that and allow me to leave on boost! Heading into the low-low 11's soon, possibly a high 10 with radials.
*To my knowledge...there may be someone faster, but I'm unaware of it.