When I had the FANZILLA installed it made a significant improvement to the operation of the car when the A/C was on. Example, When I had the A/C on, driving at 60-65 mph, when the compressor would cycle the car slowed and you could feel a power drain. This was in VIN 6058, Nov 81. This car had the fused wire jumper wire instead of the Blue Original relay. I had PJ Grady DeLorean service the A/C in an another DeLorean of mine VIN 3713, Sept 81. This car had the Fanzilla installed and it made the car smooth and effortless when the compressor cycled. The fanzilla seems to help ease the spikes, surges, and scariness of the DeLorean electrical system. I highly recommend it. Mike