I had a 640GC and although it was a gorgeous car, inside and out, I never bonded with it. I found the handling to be kind of wallowing - even though the ride quality was subpar. The 5 (I have a 540i sport line but not the sports suspension) has more body lean but a much much much better ride. It replaced a 750i, so yes, plenty of power. I decided to get away from the troublesome V8s when I bought the G30.
I have not noticed the ASD issue in the 5, and it's very quiet, which is fine for me. You can code out the ASD and get an aftermarket exhaust if that's all that's holding you back.
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Current inventory:
F22 & G05
Cadillac CT5-V Blackwing w/3 pedals
Past: E24,E28(3),E34,E36,E37,E38(2),E39(4),E46,E89,E92 (obviously),F01,F06,F10,F30,F87,G12,G30(2),G82(2)
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