Yesterday on the way to work my car started to missfire when it was on boost, it was fine when driven off. Then this morning it was misfiring all the time. Ive changed the plugs and thats seems to have solved it. BUT...... 1. I read on here that the plugs i could use were NGK- BKR6EP-11 now when i went to halfords (was desperate) they only had NGK-BKR6E-11 are these still the same plugs? and will they be fine to use? 2. The car still boosts the same but the turbo seems quieter? Normally you can hear it whining alot more through the rev range and hear it spooling quite loudly. Am i being paranoid or could something have changed? Cheers guys Ryan