i went with a digital 6 box in my car and no longer need this, the car started and ran but would break up at high rpm, so the shop went and replaced the 15 yr old coil and the msd box, i contacted msd and to recertify the box, anywhere from $10 - $172 depending on what it needs, it probably works just fine and it was the old coil the whole time, just wanted to be honest, these sell new for $559.40 plus shipping on summits web site, anyone interested make an offer