I was happily running a stock Mopar electronic setup when my brother gave me an MSD 6A box and Blaster coil for Christmas. Installing the MSD stuff with the stock electronic distributor noticeably increased the power and gas mileage. This MSD 6A box now has more than 340K miles on it without a burp. I am also running another 6A box on my truck, also without problems so far. These things start instantly.