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I was told by the Corvette Garage that they do not. Some people have tried them with LED's and they have worked, but mine cost too much to screw around and not have any warranty to cover damage if it occurs.
That link doesn't bring up anything specific on the Corvette Garage site for me...but I do have the Webelectric sequentials ( http://www.webelectricproducts.com/products.htm ) with my Halo LED's. I had hyperflash with the turn signals until I installed the hyperflash harness made by Richard at Corvette Enhancements.