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I noticed a slight difference in power with my car after changing the plugs but mainly at higher RPM's. I stayed with the OEM NGK's though.
I was considering the Bosch +4's until I compared the 2 plugs side by side. The NGK's have platinum on both sides of the spark while any other plug, including the Bosch, has platinum only for the electrode.
On the old plugs (80,000+ miles) I noticed the extra platinum had burned off.
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