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U should really get the kit put on first to determine how much u need to lower it. However, I would say that a 1.5-2.5 inch drop is usually enough for a car to look low without scraping the ground.
We can't give you any worthwhile advise. Different body kits have different clearance, so you will have to figure it out on your own. I've seen kits that scrape with as little as 1" drop.