Engines were typically delivered from BMW complete in their cowling, ready to be bolted to the front of the plane, since 1942 as Motoranlage (M) and 1944/1945 as Triebwerksanlage (T). The Motorenanlage was the interchangeable Kraftei, or "power-egg", powerplant installation format used in many German wartime aircraft, with some need for external add-ons and the Triebwerksanlage was the Motoranlage plus some external mountings, such as exhaust pipes, as a completely interchangeable unit.
The M and T versions confuse the naming considerably, as they referred to these complete kits and their "bare" engine counterparts almost interchangeably. The A, B and L models were known (logically) as the MA, MB and ML in this form, but the common D-2 was instead known as the MG. The E model was delivered as the TG or TH, seemingly suggesting a relation to the G and H engines, but in fact those were delivered as the TL and TP. It is rather common to see the turbocharged versions referred to only with the T, notably the TJ and TQ models, further confusing the issue.
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