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I run .020" on the NGK 97506's. New Eldor coils, stock turbos @20psi, E60 and the usual bolt-ons.
I started with .022" and had WOT misfires. Moved to .018", that fixed the WOT misfire but then had cold start misfires. Settled on .020" and have had zero problems from cold start to WOT.
I changed to the NGK's after melting an OE Bosch plug!
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