4x4 Review has a review of the Jacob's ignitions system. I don't know if I read it right, Its says it did wonders, but the numbers only showed a 2 Hp gain, and something like a .09 seconds off the 1/4 mile. That doesn't sound like the same claims by Jacob's. http://www.4x4review.com/products/drive_train/jacobs.asp Scott Ray '76 Scout