The Quaife is an excellent unit on the street, but they just flat out don't work well on the track in my opinion. I had one in my old 350Z and it was so bad I thought it was broken. I sent it back under the lifetime warranty and they didn't find anyhting wrong with it, but sent another new one anyway, which is awesome customer service. Unfortunately the new one didn't work any better so I switched to a 1.5 way mechanical after that and it was golden. The Carbonetic units are just as streetable and offer exceptional perforamnce on the track as well. I have also heard good things about the OS Giken but haven't tried one personally.
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