WhiteNoise

Does anybody know which spark plug runs cooler,is it thePFR6B or the PFR7B,and which set of plugs are the better ones when running higher boost settings,i.e,more power,any help appreciated thanks.
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SSCJAY

The 7's are colder, I use them on mine with no problems (1.4bar), when you start heading towards the 500 bhp mark they do Racing 8'S aswell