Body kits are primarily about looks. After using the MS wing for a while I have my doubts regarding how much downforce it actually provides.
Weight increase is not an issue. All the parts combined weigh less than half what a passenger does.
Like any kind of high speed driving you don't just jump in full bore. Work your way up and see how it handles at each level. Then let us know what it's like.

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NEW JERSEY MEDICAL MARIJUANA DISPENSARY