I went with the Weiand, it does block off the bypass. It works well out here in the california Central valley during the summer and I am very satisfied with it. It's a well cast piece of Aluminum, with Beefy Shaft and bearings. And wait until you compare the weight to the Cast Iron piece you will be pulling off. Have a good time with it! There's not much better than stripping "Dead" weight off of Your Pantera! Marlin.
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