I run my Eibachs on the 350 Roadster on the hardest setting and it is well planted.
You really do have to suck and see, however I always advise peeps to start with the middle setting for road use.
Just open your eyes a bit more.
PS: Are you running Brembo calipers or JDM.
My comments are directed at a Brembo set up.
JDM you will have to remove all wheels.
Rust is usually only an issue if you are in a salt water atmosphere, so location is key.
That is why you find all the jap imports are totally rust free.
If you are concerned about certain areas on the car, then just scrub down with a wire brush and apply some body shutz by brush or aerosol.
C'mon all you plenum spacer and pop charger gurus, help this guy out and answer his question.
We all know that a pop charger will lose you power and increase induction noise, however I do not think that is what he is asking.