hi dipsta, the ngk BKR7EVX are imo the best plug for the 850/70 t5's.... i have had 25k out of my last set and they are still looking great..... i must confress that apart from the super 4's that my first t5 had (iirc), i have used nothing except these so on a comparitive basis i cant comment, what i do know is that the BKR7EVX have never failed on me... the problem i used to encounter was (rather like ds2500 pads) they were difficult to get hold of but as pfv now sell them they are available to all... they are quite costly i accept but a good investment none-the-less.... cheers jod
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