yea you got us on the fuel consumption i think the only aftermarket part that i havent found yet is a supercharger kit for my e28 and i know you can get alot more for the newer stuff out there but yea its not as easy to find parts as a 3 series but there still out there and we dont need a bunch of aftermarket stuff cuz most 5's are fast as they are!!!
porsche boxter $40,000
bmw 535is $1,800
blowing the doors of the boxter exit to exit... pricless!!!!!