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I've used the Hurst line lock before. The install wasn't too bad at all. Just a little wiring, bending and rerouting some brake lines - well worth the results.
Tony got mine from Vinci Hi-Performance. There was a question as to whether I had active handling or not (I don't). Apparently, there are at least two different kinds. Mine was pricey.
On the other hand WallstAL and others have much cheaper versions from Hurst, I think.