The difference is negligible with modern coil-on-plug ignition. If you're running some 40psi monster and the spark is blowing out, switch to copper. For the rest of the world, go with the iridium and lose no sleep over it.
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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent
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