up until now...
they are very close...
add a pulley and ECU to the E55.. and not close anymore..
E63 is a great car.. give it some time.. it will start trapping higher MPH, but it won't be able to match the 12.1xx of some stock E55's Under good track conditions and under good weather.
I say on a good day and good track. E63's should be at 12.7xx with 116 + trap.
Most E55 stock trap around 114 to 115 and a few rare at 116's





