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After I put a GT500 air splitter on my car I could tell a big differance in how it felt on the highway. Before the front end felt kind of unstable and easily pushed around by the air wake of other cars but now it feels solid and even big trucks don't bother it.
Plus it's a cheap and easy mod probably the best one that I've done so far.
While I am not there yet, I was thinking the same thing, that more front end down force would be what is needed.