I WOULD DEFINATLEY PUT THE RN 12yc PLUGS BACK IN, IF YOU ARE STAYING WITH CHAMPION.
I have talked with dozens of mechanics an performance people over the years and they all have their favorite brand-it's like beer, coors light is better than bud light.
Since there are so many opinions and options on plugs-I just picked a good brand (with correct heat range etc.) and change them every season. 2 cents
president: skull fuckers anonymous BIGMARK