I ownd a BMW 540i ,,, now I drive a Lexus GS400 ,,, True its faster better lighter... this would hurt me to say but I have noticed the BMW 540I handles better,,, but thats all the GS400 would smoke it anytime, HOWEVER I have been looking for after market preformance parts they are very hard and very expensive to find... my Project is a GS400 with twin Turbo,, just have to find someone that did it so I can ask him
I dont want to be the first,,, 1st its my only car 2nd low experiance on converting a non turbo engine to a twin turbo car.... 3rd very small space to work in that is for sure.