I replaced my BOSCH Platinum +4's with NGK TR55IX (replaced the TR55VX) and the difference was phenominal...to say the least.
In other words...DO NOT USE THE PLATINUM +4's...for some reason of which BOSCH could not explain, the plugs were not firing correctly with the amount of volts supplied by the stock EDIS coils (my explanation as well as Badyeller).
Sent the BOSCH's back for a full refund....IM HAPPY NOW!!
FYI, NAPA auto parts are a main supplier of NGK.
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