The 240D is one of the slowest cars on the planet. I had one for a while. There is a hill on the way home that I used to test cars on. In the 240D I would hit the beginning of the hill at 70mph and with the throttle matted I slowed to 50 at the top. Only really heavy semis were slower. Go for a turboed 300D
I have also run my Porsche on that hill. In 5th going 70 at the bottom I had to lift before the top of the hill cause I was doing 120. 
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Dean
911 SC turbo, 3.0L 930 motor, G50, 930 brakes, DTA EFI, 352 RWHP DynoDynamic dyno,
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