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I heard that jet cups really only help after you've raped the interior with "mods" and slapped wings, ground effects, and other tacky junk on the exterior of your car, first.
Whether that is true or not, one thing is for sure; you need to HAVE a car to put it into, first.
I am curious. What was the answer given the last time that you asked this same question? You know...under one of your other/banned user names?