I went to the local subaru dealer today to ask about spark plugs. I asked when they would have to be changed and the girl told me that the car has platnium plugs, which don't have to be changed for 100,00 miles. I know that this can not be right, 100,000 miles?! I am currently cobb stage 2 and was thinking about going with a colder plug. I am not sure the dealership will be cool with my TBE so maybe I should just go to a speed shop and have cold plugs put in. You guys have any opinions on what type of plug I should use?