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Cold air and straights from the cat back.
Okay, neither of those mods should cause a melted plug.

The only way you're gonna melt a plug is from pre-ignition and/or a really lean A/F mix in the cylinder. What octane level fuel are you running just out of curiosity? Since these motor's are DI (Direct Injection) they operate at a much higher fuel pressure. You may have an injector issue. This may be one for the service department to check into.

U.M.
 
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