Hey Jay,
IMO when starting to add pieces that create any real downforce you're going to make it more difficult to drive on our lovely Houston streets. Considering you are keeping the 80 / 20% street to track ratio, I would choose carefully. I had the M4 GTS replica pieces by RKP on my M4, and while it did add downforce at the track, it was a PITA to drive on the street, even with moderate lowering. There are definitely trade offs.
Not sure if you were still in the market for this or not.
Pic for reference.
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