Common problem with any turbo... that I know of. I just leave it be and clean the outsitde of my 3" Magnaflow to be shiny

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2007 Cool GXP - Club Sport package
MODS: shortened WG rod, Cross-drilled/slotted rotors, painted calipers w/GXP decals, Pontiac decal on wheel hubs, Stubby antenna, 3" Magnaflow catback system..sweeeet.. PCMforless tune... super sweet...more to come