Because they did not need it. They accomplished the same thing with easier to manufacture materials.
The Germans took on a different philosophy than the allies for developing A/C engines.
The engineering challenge was fitting an engine of size weight and capability into a tiny airframe and to ensure that power was available when needed. If you notice the LW fighters are dimensionally smaller than their allied counterparts.
Rather than concentrate on large boost pressure increases from large multistage superchargers the Germans took the approach of small manifold pressure increases with a higher compression ratio. To further increase the "on demand" power they used pwer boost systems such as MW-50, MW-30, and GM-1. Their system was very efficient for their needs and worked well. The DB-605D engine developed 2000 hp on takeoff. Easily on par with the Gryphon 65.
This myth becomes readily apparent when you consider a substantial portion of Luftwaffe fighters were manufactured using "Electron", a magnesium alloy which was lighter than aluminum. Instrument panels, wheel hubs, engine bearers, and many other components were made of electron.
This not to say the 109 was not obsolete by the last years of the war. In a trained pilots hands it was a deadly opponent. However, it had developed in some ways into an unforgiving thoroughbred which the vast majority of poorly trained late war Luftwaffe pilots could not effectively use it's advantages nor survive long enough to learn.
Crumpp
