New spark plug
#2
RE: New spark plug
dont bother. there is really no performance gain in going to a different plug. as long as yours are in good shape, just let them be. when you do replace them, I recommend either bosch platinums, platinum +2, or NGK platinums. ive had bad experience with/heard from quite a few others whove had bad experience with the Bosch platinum +4s. oh, and if you drive pretty hard, get the plugs one heat range cooler than stock.
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