I ultimately used all OEM parts for the nose, and the Tapout rear spoiler. I live nearby so I held their spoiler up to their car's OEM spoiler and they looked identical. Big savings on that vs. OEM list. Tapout didn't have the front splitter at the time so I ordered an OEM splitter which was in stock. I found the Tapout dive planes and deflectors didn't match the OEM splitter carbon fabric color, so I returned the dive planes and ended up all OEM for the nose parts. I suggest you use all Tapout or all OEM for the nose since they are noticeable if they don't match perfectly.
I got all my carbon parts from GMpartswarehouse at reduced prices from MSRP, and their shipping was very reasonable. The dive plane supports were not yet reproduced, so I ordered a new fascia (bumper cover) and ended up removing them from that and attaching them to my original fascia. I had to order the fascia at a local dealer because shipping for that was more than the cost of the fascia.
Here is the parts price list for what I ordered. The ultimate cost was a lot more for me because I was learning as I went, and found out that painting the new slotted fascia was not the best idea, and cutting the slots was not difficult and saves painting costs (and PPF and ceramic). Also a few dollars for screws, clip nuts, and plastic clips from Amazon. I didn't include tax and shipping since that will vary.
GM Parts
Part Number Part Name Price
84667808 Air Deflector $7.46
84667807 Air Deflector $5.96
85563054 F Fascia (splitter) $729.98
84996873 F Deflector $590.16
84996874 F Deflector $619.67
84586281 F Deflector $577.47
84586282 F Deflector $577.47
85153560 F Fascia $301.20
Core Exchange$75.00
Tapout Tuning Parts
Tapout Tuning CT4-V Blackwing $1,795.63
Carbon Fiber Extra Aero Rear
Spoiler
You can see the summary of my experiences listed on this post:
CT4 Front Dive Planes