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My car is NA and i run the NGK's I mentioned and have had no problem. they were kinda hard to find but i ordered them at sparkplugs.com. I havent noticed any big changes since replacing the oem plugs,maybe at most smother start and idle.

NGK Laser Iridiums Part# ILTR5a-13G Stock #3811 with a .052 gap I have also seen Iridium Bosch plugs w/4 prongs instead of 1 like NGK. Dont know if that makes them any better though

Thank you

Hi everyone This might be a stupid question but is it posible that the focus 2.0 is the same engine as mazda 3 2.0, this is fairly common practice for manufacturers. If this is the case we may be able to interchange parts for cost and performance.