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Run the coldest plug you can without fouling.
WR8DC is listed as the correct plug for OB's in some places. Porsche switched to 7's with the 4.7 and kept the same heat range through the GTS.
I've been running WR6DC plugs for a while now under boost with no issues. I'll be installing 5's this spring, see how that goes.
Last edited by hacker-pschorr; 03-03-2008 at 11:13 AM..
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