I bought this to replace an MSD Digital 6 that had crapped out after 3500 miles on my Cobra replica with a 460 CJ motor. The Mallory was very well priced, about half of what I paid for the MSD box. It feels like it has added another 30 horses. Can't wait to see if gas mileage also goes up. Makes me want to get a dyno run again as the MSD was dogging it.Spoke too soon-after 800 miles this box just quit. Had to buy another one over the weekend (MSD 6AL) to get my car to a car show today. Amazon refuses to help me out and say I have to work through Mallory to get any restitution. Too bad it could not stand the test of time.