Originally Posted by Power-Shift 
ok.and wat about the heat range,is a 5 better for the mods i have?(mods in sig)
No, you'll be safer with 6's.
If your turbo or squirting the bottle, use 7's.
Usually heat range wont matter on what mods you have, unless your turbo or NOSing.
Now it more depends on how you drive your car. If you floor the car a lot I would stick with 6's, otherwise the 5's might overheat.
5's are good if you start the car a lot, but driving it too long, or getting the engine too hot might make them foul.
You can see how a spark plug is acting up by using this guide
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