Ok so honestly a Kammback isn't practical enough for met yet as of now. I want to maintain visibility out of my rear window, and the only way to accomplish that is to spend big bucks on clear coroplast or something like lexan. But I still want to improve rear airflow behind my vehicle, since that is where the most aero gains can be made.
I took a look at the rear lip spoiler on the hybrid version of my car, and was considering fabricating one of those...or one that was even better.
Here are some ideas I have:
1. Simple replica of the hybrid's lip spoiler
2. Hybrid lip spoiler with ridges to act like an upper diffuser
3. Spoiler similar to the LSR civics:
The second one seems to have raised lines all the way down the rear window?
Thoughts, comments, and/or critiques on which one would be best, or if I should leave it all alone altogether?