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Probably the wrong section for this post but Z1 is probably the best for tuning, if you just need install work Check out Oden's custom, he does most of the work for our local G's group. https://www.facebook.com/OdensCustoms
I've heard SuperStar Customs in Lilburn is pretty good, haven't been yet but planning to stop by there next week. (They share a shop with Global Alliance)