I had 5 people in my Mustang once, cruising down 294 toward Chicago. Traffic came to a sudden stop except for me. 1000 lbs of people made for some serious brake fade. Scared the crap out of me. I had to steer for the shoulder to avoid hitting the car in front of me. Moral of the story - Your car may be fast getting up to speed, but remember that you might have to stop, too.
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351W 89 Mustang GT Convertible