My friend ran my cousins E55 last nite, they had some good runs, he is a forum member aswell maybe he will chime in aswell
2008 E90 N54 335i
JB4 map 7 on ms109
Fully catless
CP-E FMIC w/ AA charge pipe BOV
19" rims
full weight
No oil cooler
vs
2004 E55 AMG
No resonator/ No secondary cats
Meisterschaft mufflers
Upgraded IC pump
Dyno'd at 411WHP
traped at 115-116mph
30-150mph 3 runs.
Make a long story short, as the go pro took pics instead of videos
The 335i would stay close, neck and neck at speeds below 120, once above 130 the E55 would come and put half a car to a car by 15Xmph
Was surprised up top the E55 gained, im guessing the E55's gearing up top looks to be pretty damn good.