What you are seeing on the outside of the casting is from something called “surface heat checking”.
The casting you are referencing is made via the “high pressure die casting process”.
Surface heat checking is something that happens to the steel used in tools (molds) during the high pressure die casting process and is expected.
In high pressure die casting, aluminum is forced into the steel tool (mold) at temperatures exceeding 1220 deg F (660C). It’s then rapidly cooled via internal cooling channels in the mold to solidify the charge. The mold then opens and the solidified aluminum part is extracted. Within seconds, the mold closes and is once again forced full of molten metal. This continuous, rapid heating / cooling cycle is very detrimental to the surface finish of the molds surface. Over time – say 50,000 – 100,000 shots the steel used in the mold begins to develop micro fissures on the surface. With each subsequent shot (heat/cool cycle) the steel begins to erode away more and more.
What look like “cracks” in the casting is actually extra material. The extra material is there because it’s filled the cracks that are now on the outside of the molds surface because the mold has some slight surface heat checking.
Bottom line…..normal thing that happens, nothing to be worried about. No loss in part performance or integrity.
BTW: Congrats on the new ride, enjoy!