of course i tried the 2013 model 528i, and we are comparing stock cars here
328i v 528i, no need to compare ecu mods, because the basic 328i is faster and sportier, its a fact of physics.
unless u get the 550 or M5 its still a big big car for a 2L engine.
likewise you can't compare a 335i with a 328i.......
The latest Edmunds track test as posted somewhere on the forum had the 328i Sport at abt 5.6secs 0-100.
and you can spec the 535i as M sport, just that there's no discount!
full M package and M Performance aerokit,sidestripes, MP 405 20inch wheels, Wilson dual exhaust in 304sus with oem valve 5 inch tips, Prokit tint and black roof