Yeah, you're right. Sorry about that. I realized that when I thought about it more on the way home. But hey, it settled the argument.
Weight has nothing to do with top speed.
The backpack of weight argument is more akin to that of a parachute. Yes, if you add more weight to a parachute it will fall faster but that's because the added mass times the acceleration of gravity creates more force which in turn would create a higher terminal velocity.
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351W 89 Mustang GT Convertible