The M and T unitized engine formats added secondary designator suffixes, which especially for the 801 radial (and perhaps others), did not always match the letter suffix that designated the bare radial engine used for a particular unitized installation, confusing the naming of the 801 engine series' subtypes considerably. These suffix designators initially referred to these complete kits and their "bare" engine counterparts almost interchangeably. The A, B and L models were known (logically) as "Motoranlage" style MA, MB and ML engines in this form, but the common D-2 was instead known as the MG. As the war wore on the confusion increased, the E model was delivered as the "Triebwerksanlage" style 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 for the more completely unitized "Triebwerksanlage" installations, notably the (most notoriously of all) TJ for the BMW 801J turbocharged radial subtype, and the TQ models, further confusing the issue.