Bob, Thanks for the comment on the coil. I have been trying to tell everyone for more than a year, electrical has to be updated as well and not wait for something to break. The new 18,000 volt coil does take a new resistor, but I can wrap my car upto 6000 rpm's easy. I don't recommend it, but 5500 is no problem. If you don't have a good electrical system in the car, battery and alternator, the car can't achieve it's maximum. It will also run better. John Hervey www.specialTauto.com