I have a CS with GC's version of the HAS kit.
The HAS and BMW HAS kit version is cool the only thing i don't like are the spring rates. They lower the car but do not do much for body roll control.
The GC version at least you can pick a spring rate that works for you.
Currently i am running 500 6" long springs with helpers and 700lbs 8" rear spring rates.
if you want to go a little lower than the image below you can do 5" front springs.
Front has about a 1.5 finger gap
Current setup works good for Track Days on Sport +
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