That is really expensive. The spoiler is a small piece with a basic shape, I couldn't justify paying more than say $800 for it alone. The rear (side) brake ducts should be around $500 for the set for the same reasons, and the front splitter no more than $1,000.
The rear tail-light bezel can justify a higher price because of its more complex shape (as long as it has precise fitment), so I'd go up to $1,250 on that piece as I could justify it for the additional work involved in making it fit right. The front brake ducts are not worth it in my opinion since they're barely visible.
The reasonable prices for the CF parts I want would be:
- Rear Ducts: $500
- Rear Spoiler: $800
- Rear Bezel: $1,250
- Engine X-Brace: $850
Total: $3,400
I'd also forgo the front splitter; makes the car look too much like a honda tooner ride and while the X-Brace is large, it's a very basic shape so $850 is where I'd be on that one.