So today I heard and smelled a faint exhaust leak. Found out the header to overpipe gasket failed.
The leaking gases were pointed right at the plastic splash shield and plastic rivets securing it to the skid plate. Melted through one rivet and got that mini heat shield a little toasty.
The gasket that failed came from PLM with their OP.
Replaced it with the graphite gasket from JDL that came with the header. Hope it holds up better.
My fuel trims are probably jacked up now so I'll reflash my latest tune revision tomorrow and start over with some fresh logs.