How do you figure the E55 as a sleeper? If one pulls up next you you can see AMG brakes, wheels and a different stance than what any other E has.
A big reason I would see to have a sleeper would be cops. Are the going to be looking at you in a 30 year old sedan or the Honda with the wing, body kit, big wheels etc.
and is'nt the SL65 and AMG motor? If so thats not really a stock motor because AMG is just an in house tuner for Mercedes much like the M division of BMW.
O ya that three series I think your talking about is the Hartge H5 (?) that is a beast of a car there was a comparison I downloaded of Limewire of the M3, Alpina 3, and Hartge and the Hartge just used brut force in all aspects. They called it driving on the edge with the blip of the throttle. overdoing things? yes of course thats what america is built on