difference between PFR 6B AND 7B spark plugs?
\m/ ^_^ \m/
Joined: Dec 2001
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From: 2010 Time Attack Club Pro Champion - Powered by ScoobyClinic
it's the heat range, the 7B runs colder for hotter running engines, all depends how much you've done to your car, standard 6Bs are fine anywhere upto 300-330bhp
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