Here's some pictures of my tiny turbo, a mini Garrett, as you can see the manifold is integral to the turbine housing and it has a fast warm up channel for the cat.
This is actually the mid range tubo for the early Smart range, some high spec Brabus used one of the same dimensions externally but with ceramic coatings on some surfaces and internal differencesalong with a watercooled chargecooler, the lower spec version has a smaller induction inlet and compressor and smaller exhaust outlet.