That big tube down and to the right of your hand leads in to the turbo inlet. I wouldn't put anything less than a piece of thin plywood or siding in front of a turbo inlet, and for the love of all that's holy, don't get your fingers in there.
Edit: the actual turbo inlet is probably where a spray can top will fit. That sounds about right but I wouldn't trust myself to not actually jam a finger in there if in a hurry.

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1982 300sd from craigslist $800 greased on one tank with NO CONVERSION in the Hot Texas Sun. (currently dead & awaiting engine damage investigation and/or longblock swap)
new daily: '03 vw 5speed jetta tdi wagon. bagged&chipped