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The thin dark slot running across the width of the cover opening is to feed air to the pair of intercoolers for the turbos.
As on every 911 with turbos, the turbos are mounted down low. That aluminum casting with the hoses going in and out of it, sitting to the left of the compressor outlet is the turbo oil drain sump. The engine has a scavenge pump to suck the oil drained from the turbos because the turbos sit so low and do not have the benefit of gravity to move the oil to the main oil pan. Look above and behind the compressor housing and you can see the black intake tube which has to make a nearly 180 degree turn into the compressor inlet.
This is a view from the other side of the same turbo giving a better look at the turbo oil drain sump. You can also see the heat shielding to protect the wastegate actuator. Pieces of heat shielding runs along the body work around the turbo protecting the chassis from the heat of the exhaust manifold and turbo.
The compressor outlet tube is protected from heat by two heat shields: one wrapping around the turbine housing and exhaust pipe, and the other heat shield running along the chassis.
The plastic composite oil pan has a heat shield around it to protect against heat from the exhaust manifold. The exhaust manifold appears to be a double-walled stainless steel design which is pretty much the norm nowadays. It’s getting rare to see the old heavy cast iron exhaust manifolds.
This opening into the low pressure area behind the rear tire is the outlet for the air going through the intercoolers.
