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Any time you alter your suspension you need an alignment. Doesn't mean anything necessarily has to be changed but you want to check camber, toe, and caster to make sure there within spec. 1 or 2 degrees of negative camber isn't too big a deal, but it will wear your tires unevenly. Trust me, I've been there. I lowered my '92 Accord about 3-3.5" and the camber was wayyy off; the tires ended up wearing out quicker and unevenly (more on the outside.) Camber kits aren't that expensive, I'd look into it...