I have a '98 Buick with a supercharged 3800 series II in it. I am getting ready to change the plugs/wires, and I was wondering what to do about the plugs. I do about 80% of my driving on the highway/interstate 70+ mph, and I have put in a 180* stat, gutted the airbox and put in a K&N panel filter. I have been finding that most people recommend going 1 heat range colder than stock with or without a smaller pulley. I was just wondering if this is true. I have the stock pulley on the car, and I don't want to run plugs that aren't going to benefit me. If I should run the stock heat range, does anyone have the part number for a COPPER plug that would work? I know that the NGK TR55's will work but they are 1 range colder.
Any info on this would help a ton.