If you cannot prove that your car didn't lean out, which could have been caused by a number of things, your story doesn't carry much weight.
Too many of us are using and have been using the PFR6B-11B's with too much success to be blamed for blowing your motor.
Although running colder plugs in your case may have saved your motor, there was obviuosly another issue going on that cooked your valve.
Grow a pair, things go wrong on the track and break. You have to pay to play.
boostpro.net
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