Kostas Dee wrote:NGK BR9ECM for hotter climates,BR10ECM for colder,these are the stock plugs and they work just fine.

Read this : http://www.ngksparkplugs.com/tech_support/spark_plugs/p2.asp?mode=nml

It's really not correct to simply say use a cold plug in hot climates, and use a hot plug in cold climates. You have to look at the state of tune of an engine. For most applications the BR9ECM is fine. You might move to the 10, or 10.5 if you have a highly tuned engine used for racing.