I got my undertail from these guys, there was a delay with the shipping but he threw in a set of lowering links for free. Talk with him and show some respect when you have an issue and he is more than willing to work with you. I even asked him about some of his negative feedback and simply stated that he does not respond well to rude customers. Not the greatest idea for staying in business but understandable. Two guys I race with at a local track use his extensions and love them, no problems at all.
If you want the best deal then use NYCPARTS off ebay, don't expect fast shipping or pay for any expidited handling but be patient and save some money... Just my .02