I had the shortened Koni inserts up front with Progress springs back in the day. They won't make much of a difference at all as far as slamming the car goes. Plus they blew out in less than a year.
Your best bet is to get a set of coilover dampers that have adjustment for body height as well as preload if you don't want bags. Either the JIC Magic, Megan or D2 dampers would be what you want. There is no way I can see you slamming your car the way you want with springs unless you spend a lot of money getting custom struts and shocks made and then you'll end up spending as much as you would for a nice bag setup.
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