You can never have too much spark - resistive leads are pretty much standard nowadays so don't pay too much.
You should also consider high performance plugs that can take the extra wellie without needing to be replaced constantly. Be certain that the plugs have the same reach as the standard ones otherwise your likely to have valves or piston crowns smashing into them.
Plug heat rating is another factor, this is determined by the profile of the insulator on the anode. If you tune your car in other ways you may need a colder plug to prevent over heating. If you do short journeys then hotter plugs help as they literally get hotter, faster thereby shifting the carbon deposits that cold running causes. |