A colder or hotter plug refers to the heat range of the selected spark plug. A colder plug is better at transferring heat away from the tip of the spark plug, while a hotter plug retains heat for longer than standard or colder plugs. This is all about keeping the engine in its maximum efficiency range, which creates power.
Colder plugs are designed to be used in engines that run higher boost pressures and loads. Colder plugs are a good option for heavily modified vehicles or vehicles that are often used at high RPMs. Colder plugs aren't necessary for a stock vehicle or one with light bolt-on modifications. You won't be taking advantage of the shifted higher temperature range and may actually cause more harm than good.
A good rule of thumb is to always consult your tuner when deciding which plugs to go with, if your vehicle isn't tuned then it will probably be best to just stick with the OE plugs.
If you're interested in finding a spark plugs for your vehicle, head over to fcpeuro.com and start by entering your vehicle into our vehicle selector.
Once your car is added to the selector, there are a couple of important ways that we advise correct fitment.
The first is the "fitment indicator" shown on the Product Page after selecting a part. This box is below the "add to cart button" and has two states. It will either say " Yes this part fits" or "Part may not fit, click to verify".
Sometimes the green box will be accompanied by extra fitment notes. These notes may be independent of the information gathered by the vehicle selector. IE: VIN-specific options, need to be taken into account when determining overall fitment.