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I have over 30,000 miles on the NGK 97506's at stock 50i boost levels (I originally was going to install a JB4) without any issues and both my turbos seals are shot as noted by the nice wet oily residue coating the inside of intercoolers and inside the turbo inlet ports. I think they are pretty hard to foul or I would have been plauged with misfire codes and haven't had one since new eldor coils and these plugs and I flog the engine daily...
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