I appreciate using quality construction methods to make your parts, very much so.
Some of the parts made for these cars from fiberglass and CF may be weak and heavy but not many are made and so far the hood from Seibon, which is very well made, has proven to be much lighter that stock as is the hatch door, I am sure there are other well made parts available as well that are not pure CF.
Calling your parts aero is incorrect if they are made for style with out real aero advantages, your splitter is the best one you have shown, the flares the worst by far but could be great if filled in properly where the aero aspect is missing.
As mentioned tie the splitter into the flares, cover the front of the tires, even better add some canards...now we have real aero
The "wing" extension will not generate much down force even if you filled in the top of the stock wing which creates to much turbulence that decouples the air when adding a lip, the steeper the angle the worse it will get. Only a real wing will do much good, I have looked into the extensively.
I will take a look at your "cup Spoilers", hopefully they are a properly designed aero part.
Why do I care, why so passionate, so outspoken? Because there are many less experienced that are prone to buy into misleading hype, go for style over substance, they need to know the truth so they can make better choices with their hard earned money that some companies go after.
Most sincerely,
Rick