7AL by MSD

The 6 series box is perfect for the street. However, the only real gain is in low RPM engines. The multi spark works well for power, torque and mileage on daily drivers. It has no real edge over the chome box. I have run both.
If your car is a street macine with a high stall, the MSD's low RPM range benifit is a moot point when driving.
Otherwise, for my daily drivers, the multi spark adds mileage.