One thing I can say is that thee 91's are very easy to work on for do it yourselvers..Much more simplistic...lighter, faster

As far as amenitis of course the 6.0 will have them where as the 91 doesnt but you can get CF interior pireces for dash and center console to upgrade look and I prefer pop up lights myself..both beauiful cars...91 would have less to break down and repair simply because of less mechanical systems it has..

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91 DIABLO 96 VIPER ROADSTER..SUPERCHARGED..650RWHP